Circuit Sports Coilovers and Arms review thread...

[dorkidori_s13]

I decided it was time to replace the suspension in my car. Im not building the car as a track beast, but more of a restoration project so I wasnt really in the market for super expensive coilovers (though Im sure I will get bored and antsy and replace them at some point lol, Im fickle)

So bumming around the web, I happend on Circuit Sports coilovers. Ive had some of their parts in the past and they were always of pretty decent quality, so no complaints here. I gave Phase2 a call and they got my order packed up and shipped out to me ASAP!!!


Here is everything as I was unpacking it...

https://sphotos-b.xx.fbcdn.net/hphotos-ash4/281395_2089714894178_2387873_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-snc6/254684_2089715734199_171985_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-prn1/284793_2089715974205_2666282_n.jpg


The beat up inside of the coilovers box was more than likely from UPS handling. Honestly, theres a reason the people who load the trucks at UPS and FEDEX are called "Box Throwers". Its precisely what they do (I worked at FEDEX for a few days as a box handler)


So after unpacking everything, I thought I would take some nice layout photos. The arms themselves are VERY nice quality. I know a lot of people see these and think "cheap and skinny", but they couldnt be further from the truth. All of the arms are super hefty and are very impressive...

https://sphotos-b.xx.fbcdn.net/hphotos-snc6/224489_2089715174185_1687749_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-ash4/284449_2089715254187_4437101_n.jpg https://sphotos-a.xx.fbcdn.net/hphotos-snc6/249339_2089715614196_698652_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-ash4/224499_2089716094208_3807116_n.jpg https://sphotos-a.xx.fbcdn.net/hphotos-snc6/263198_2089716494218_4830297_n.jpg https://sphotos-a.xx.fbcdn.net/hphotos-snc6/284255_2089716694223_4876943_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-ash4/223726_2089717454242_3365408_n.jpg

And one thing I decided to do since Ive never seen a thread on zilvia before when someone posts a product review, I decided to get my measuring tape out and drop the lower mounts down as far as they would go so you guys can see the length of them fully dumped...

https://sphotos-a.xx.fbcdn.net/hphotos-snc6/267299_2089718214261_5842215_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-ash4/185240_2089718334264_4260989_n.jpg


Heres a few photos of the installed arms and coils in the rear after 8 hours of breaking stock 20 year old bolt torque and lots of swearing. I forgot to take front pics, i still need to dial in my caster a bit more so ill shoot the fronts when i have the wheels off next time...

https://sphotos-a.xx.fbcdn.net/hphotos-snc6/198688_2089718614271_4392451_n.jpg https://sphotos-a.xx.fbcdn.net/hphotos-ash4/281208_2089719214286_1995225_n.jpg


Heres a few shots of the car fully lowered in the rear (without removing preload from the springs) and about halfway down in front. All of the arms are correctly adjusted for minimum camber and 0 toe in front and rear. The fronts are fully out on the camber plates and I still have like 2 degress of camber on both sides (so cambering wheels is NOT an issue with these coilovers)...

https://sphotos-a.xx.fbcdn.net/hphotos-snc6/190704_4738169823896_1793141767_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-ash4/427644_4738169863897_1982079167_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-ash4/1534_4738170183905_629456754_n.jpg https://sphotos-b.xx.fbcdn.net/hphotos-ash3/541007_4738169903898_1838936783_n.jpg


MY REVIEW:
Ive owned A LOT of coilovers in my days of building these cars (2 sets of D2s, 1 set of Tein HEs, 1 set of JIC FLT-A2s, 1 set of JIC FLT-ARs and one set of Buddy Club Racing Specs) and thus far, my ONLY bitch is that the rears dont go nearly low enough without removing any and all preload. My JICs and my Buddy Clubs would dump the car to the ground on 15s (hell, even on 18s I could drop the frame rails to the ground), but seeing as these are a "budget coilover", I can understand the rears being the way they are. My D2s never went super low in the rear without dropping the spring perches down past preload point.

As far as ride quality goes, I do believe Circuit Sports when they say "valved for US roads". Im running the Street setup (again, no need for suspension so hard it rattles my fillings out), and these things are actually pretty damn nice. Im currently running 5 clicks up front and 3 in the rear, and I am very impressed thus far. Took the car around town after I installed and aligned everything, and not once did the car feel uncomfrotable. I havent tried turning up the dampening yet, but in all honesty, I really dont feel the need to.

What the overall damper durabilty is like, I wont know for another 6 months to a year (if i keep them or the car that long). But judging from all the parts Ive bought in the past from Circuit Sports, Im sure they will hold up just fine. The build on them is fairly standard and straight forward for coilovers. Though, I was impressed at the fact the brake line brackets were built in/welded on. Most "affordable" coilover setups dont have this. They just throw a bracket in the box.

The arms that I bought were all very impressive. They are very bulky and well built. Ive seen a lot of crappy "ebay" arms in my day, but these are DEFINATELY not ebay crap. All of the rods use spherical mounts that seem to be fairly standard on all control arms. But, there are no complaints here as they far exceeded what I thought I was ordering.

All in all, if youre looking for a decent coilover for a decent price, thus far, I would totally recommend these. Theyre not going to slam you to the ground like JICs or Buddy Clubs would and theyre not track bred monsters, theyre a fairly simple $800 coilover. Not a $2000 setup. If youre on a budget, or just looking for something that is a good step up from shocks and springs, then these are right up your alley. The arms are totally worth the cash being a more affordable setup and the build quality will surely impress you when you see them in person.


UPDATE 03-2014:
So almost 3 years later and the arms are holding up just fine! Car has been daily driven everyday since putting all the Circuit Sports arms on and theyve held up great! Ive since changed coilovers though. I swapped the CS coils for Fortune Auto 500 series as the FA's go much lower and are just an all around better product. Though, again, I will say that the CS Coilovers were a great entry level and affordable coilover. When I sold them, they were almost 2 years old and had zero signs of any problems! Again, the CS coils were daily driven everyday as well so I can attest that Circuit Sports suspension parts are pretty damn decent for everyday use. How they hold up to heavy track duty, Im not 100% sure on, but if the wear and tear of everyday driving is any sign of quality, Im can bet they hold up just as well on track!

[EnemyS15]

great review!!!!!

[dopplganger1]

I had the suspension arms for about 3 or so years put about 50k miles on them and never had a problem or squeak from them and there was some very rough driving put on them. I sold them after that but they were fine when I did

[jontron5000]

nice review. I've been looking for a cheap (but not too cheap) coilover setup and glad to come across these. I'm also happy to hear they are not stiff which is the biggest problem with mines since I only use my car as a daily

[dorkidori_s13]

nice review. I've been looking for a cheap (but not too cheap) coilover setup and glad to come across these. I'm also happy to hear they are not stiff which is the biggest problem with mines since I only use my car as a daily


well these are stiff, but not the kind of stiff that will cause your kidneys to stop working lol ;)

my tolerance for a stiff ride in a car is fairly high, some people are pickier than others. these coilovers compare to my buddy clubs as far as good ride quality goes (those were the smoothest id ever owned)

[phase2]

Thanks for the plugs guy, regarding the rear not be able to dump low enough the only reason is we worked with Circuit Sports initially to have an average coilover that will do just the best of both worlds (street and track). However, we have been getting alot of request hoping the rear will go lower. In all honesty, most coilovers that went low never really take into account to adjust the stroke higher to compensate for the shorter length shocks. Lower length shocks IS available from Circuit Sports, we will discuss with Circuit Sports perhaps to switch out the rear length shocks to something like 20-25mm shorter length with adjusted longer stroke in the near future.

Wayne
Phase 2

[mad-ass]

I've been running CS RUCA's on my S14 since 2007, lots of street miles and few track miles on them. 0 problems!

Hey Wayne, can you please tell CS to start making the exhaust again? I don't know why they discontinued it. It is such a nice exhaust.

[s13 @ fullboost]

looks nice i have the cs coolant res and i love it

[phase2]

I've been running CS RUCA's on my S14 since 2007, lots of street miles and few track miles on them. 0 problems!

Hey Wayne, can you please tell CS to start making the exhaust again? I don't know why they discontinued it. It is such a nice exhaust.


What a coincidence, we are already in discussion with CS to bring the infamous CS dual tip back alive....afterall, we can't let Megan have all the Glamour right? :)

[mad-ass]

What a coincidence, we are already in discussion with CS to bring the infamous CS dual tip back alive....afterall, we can't let Megan have all the Glamour right? :)

and you have my permission to keep using my video on your webpage! :)

I have the exhaust on both of my S14's now[finding the second one after it's been discontinued for over 2 years was..well...HARD], and first one still going at it just fine, still love every min. of it.

[dorkidori_s13]

hmmmm, super interested in the shorter stroke dampers to go lower now ;)

[TSLegendary]

Thank's a-lot for your review Dorki. I just recently ran into a problem with my front Cusco Comp- S coil-overs and they have finally blown.Are these springs the regular 62mm ID springs (2.5") most coil-overs use? I have considered installing the Cusco 7k / 5k spring set up on these coil overs to make the ride smoother.

[dorkidori_s13]

im not sure what the length of the springs are but it seems like most coilover springs use the same circumference springs so im sure you could interchange them fairly easily to see if they work.

but in all honesty, the springs that are on them arent too bad. again, these coilovers arent super harsh and ride pretty decently at lower settings. i turned my fronts down to 3 clicks 2 days ago and it did seem to actually make a bit of a difference over the 4 clicks i had them at before. im gonna set the rears to 2 clicks today and see what that feels like

also remember one thing as well as far as ride quality is concerned. its not all in the spring of the coilover. the damper also plays a very large roll in it as well. cheaper companies will use super stiff springs at times to make up for fairly poor or cheaply performing dampers. these circuit sports seem to be a good mixture of decent damper and decent spring (though i have been pondering buying some swift springs to test those out)

[dorio]

dorki, did you have aftermarket arms or bushings with your previous coilovers setups? just wondering if you're doing a fair comparison cause you say that these are smoother than any of your previous coilovers. i say this cause switching to es bushings alone have calmed down my car a lot.

[dorkidori_s13]

this is my 5th 240, so ive had quite a few sets of control arms previous to what i have now, but they were always the same brand (tcsportline). i dont bother with rubber or silicone bushings as im not super bitchy about ride comfort. personally, having a harsh/stiff/solid ride in a car is "normal" to me. my girls ford focus and her best friends volkswagen jetta are just obnoxious because there is NO road feedback whatsoever. its just all soft and smooth.

one thing a lot of people dont realize is that with 240s, the stock suspension pieces are absolute crap. youre driving around on 20 year old blown and torn bushings. ANY upgrade you make to them, be it brand new OEM bushings, silicone aftermarket or pillowball jointed arms makes WORLDS of difference. the most noticable is in the tension rods. the tension rod bushings nissan used were rubber outside with liquid filled insides. after about 8-10 years of road abuse they pop and begin to wear horribly which basically sends your caster control to hell (hence why your steering wheel wobbles so much when driving even with balanced tires)

[dorkidori_s13]

im thinking about splooging for a set of XXR 513 16x8's just so i can get some decent rubber on the car and get a bit more offset to my wheels. im curious as to what the car would look like on my current suspension setup with some 16s (anyone in vegas wanna loan me a set for some pictures and fitment edits for this thread)

and please dont start in on me with how crappy or cheap XXR wheels are. yes i know theyre knock offs, yes i know theyre cheap, but im not looking to make this car a track beast or a show car. i just want something decently priced that will work for the time being.

[TSLegendary]

Do you mind if i chime in when i get my set of CS DP1's? I will try out the Cusco Springs.
I felt confident enough in your review that i bought a set.

[dazed]

The arms themselves are VERY nice quality. I know a lot of people see these and think "cheap and skinny", but they couldnt be further from the truth. All of the arms are super hefty and are very impressive...

https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc6/249339_2089715614196_1584396988_32034489_698652_n. jpg


This is a great review thread, and I'm sure it will help people out, however I have to disagree with that statement. I would personally trust CS for smaller things, but not RUCA's. Just look at the difference between CS and Cusco/Kazama RUCA's (what I'm running).

http://www.240edge.com/performance/r-u-arm-cusco.jpg

Much heftier. Mine survived a 25mph+ impact with a pole.

[dorkidori_s13]

This is a great review thread, and I'm sure it will help people out, however I have to disagree with that statement. I would personally trust CS for smaller things, but not RUCA's. Just look at the difference between CS and Cusco/Kazama RUCA's (what I'm running).

Much heftier. Mine survived a 25mph+ impact with a pole.

there are brands out there that are much better than CS yes, but in all honesty, CS will work for 90% of the people on these forums. a lot of people jump on the "its crap" band wagon without even trying said product first. my CS arms are a lot more heftier than my TCSportline arms were, and you know something, i went over a curb that was a foot and a half tall at about 30mph with my TCSportline arms, guess what? they didnt break, bend or even dent. one had some minor scuffs on it that came out with some steel wool.

cusco and kazama arms are almost double the price of circuit sports as well. i really could care less about spending that kind of money given my car is a daily driver that will see light, if any, track duty at all. the CS arms are PERFECT for those people who want something that is built well and will fix their alignment issues without breaking their wallets.

[dorkidori_s13]

Do you mind if i chime in when i get my set of CS DP1's? I will try out the Cusco Springs.
I felt confident enough in your review that i bought a set.

feel free to man, i started this thread to really push Circuit Sports stuff out there to people who had questions about it given no one on these forums has done a write up and review thread for them.

and judging by the amount of attention this thread is receiving (in views), it seems to be doing the job ;)

[jorge1190]

I have Circuit Sports RUCAS and Toe Arms on my S14. Ive had the RUCAS for 2 and a half years and they still adjust easily and have not rusted. I daily my car and it sees Auto-X events about once a month. Ive never had an issue with CS parts.

[dazed]

my CS arms are a lot more heftier than my TCSportline arms were

....Yikes. Must look like toothpicks.

I completely agree with you that CS works for most people out there, especially DD'd cars, but I DD my car too, just depends on how much you want to spend.

[dorkidori_s13]

....Yikes. Must look like toothpicks.

I completely agree with you that CS works for most people out there, especially DD'd cars, but I DD my car too, just depends on how much you want to spend.

honestly ive been building these cars long enough to know what is complete crap/waste of money and what is an actual decent part. for the majority of people in the 240 world, these arms are WELL ABOVE the curve of whats available. the ONLY other control arms i would really drop huge dime on that are available out there are powered by max arms. all of their stuff is built here in america, its all built by people who beat the shit of their cars professionally, and its all engineered in house. not copying from other people out there.

but yeah, these are quality pieces and im very happy with my purchase ;)



now i jsut need some new wheels....ugh

[SlideOrDie831]

for the money they work great.

[dazed]

Yeah PBM shit is quality for sure. Their arms look a lot like the SPL ones which are like $50 more.

[dorkidori_s13]

Yeah PBM shit is quality for sure. Their arms look a lot like the SPL ones which are like $50 more.

i get the feeling that SPL may contract PBM to make their arms as the SPL arms changed at almost the exact same time that PBM brought their new ones out.

[Butcher240sx]

I've had CS RUCA's on my hatch for over a year now with no problems. When I got it it had some "ebay" parts that were both cracked at the welds. Not safe. The PO put them on 3 months before I got the car. Just installed CS tension rods and they made a world of difference in reguard to steering response and turn in. Don't notice any difference on the straights other than no more wandering front end. Happy enough to buy the rest of their arms tomorrow.

[dorkidori_s13]

940+ views...heh, this is a good thread ;)

[axiomatik]

This is a great review thread, and I'm sure it will help people out, however I have to disagree with that statement. I would personally trust CS for smaller things, but not RUCA's. Just look at the difference between CS and Cusco/Kazama RUCA's (what I'm running).

http://www.240edge.com/performance/r-u-arm-cusco.jpg

Much heftier. Mine survived a 25mph+ impact with a pole.

Don't know what your point is. They have completely different designs. The Cusco/Kazama have to be much thicker because they have only one tube instead of 2. Doesn't mean that it is stronger.

[pink godzila]

Anyone need circuit sport pm me !!!!!

[dazed]

Don't know what your point is. They have completely different designs. The Cusco/Kazama have to be much thicker because they have only one tube instead of 2.

Different designs huh? You don't say.....

One has two tubes the other only has one? Golly gee I didn't see that.

You said you don't know what my point was, and then you basically just restated what I said, in more depth.


Doesn't mean that it is stronger.

:mepoke:

Cusco/Kazama/PBM/SPL all use single tube design. But then again, I mean, y'know it doesn't mean it's stronger or anything, those companies don't know shit about R&D.

[dorkidori_s13]

Different designs huh? You don't say.....

One has two tubes the other only has one? Golly gee I didn't see that.

You said you don't know what my point was, and then you basically just restated what I said, in more depth.


:mepoke:

Cusco/Kazama/PBM/SPL all use single tube design. But then again, I mean, y'know it doesn't mean it's stronger or anything, those companies don't know shit about R&D.

keep the drama at a lull guys.

[TSLegendary]

Just Finished Installing the DPS Coil's and honestly they feel really good.I didn't even bother installing the Cusco 7/5k springs cause the CS springs felt great already. Definitely worth the money and considering I've felt a set of BC coil-overs these are most definitely a more tolerable ride.I have the fronts at 3 clicks and the rears at 1 but i plan on upping it up to 2 but its only out of curiosity.

[dorkidori_s13]

Just Finished Installing the DPS Coil's and honestly they feel really good.I didn't even bother installing the Cusco 7/5k springs cause the CS springs felt great already. Definitely worth the money and considering I've felt a set of BC coil-overs these are most definitely a more tolerable ride.I have the fronts at 3 clicks and the rears at 1 but i plan on upping it up to 2 but its only out of curiosity.

what size wheels are you running?

i wanna see what these things look like on a set of 17s (or 16s, anything but stock lol) did you fully dump the rears?

[TSLegendary]

16x7's all around +38 offset. Nothing fancy. The rears aren't too low. I like my rear being a bit higher then most lowered cars though.

[BustedS13]

doesn't Fortune Auto sell coilovers with your name on them? why do you not have those?

[dorkidori_s13]

doesn't Fortune Auto sell coilovers with your name on them? why do you not have those?

NO!!!!! i never made them because all people did was bitch and complain so i decided it wasnt worth my time or patience to produce something that wasnt appreciated.

kinda funny though, cause if jimmyup woulda done the same thing, you guys woulda been all over his nuts. just thought id point that out...

[dorkidori_s13]

blar blar blar blar....

[dreamin240sx]

i have some cs parts on my s13 and i love them well worth the money

[Sideways570sx]

I want some cs coilovers for my s14

[Prove It]

Arms look solid. as for the coils...ehhhh

[Zenki_Kouki.5]

This is a great review thread, and I'm sure it will help people out, however I have to disagree with that statement. I would personally trust CS for smaller things, but not RUCA's. Just look at the difference between CS and Cusco/Kazama RUCA's (what I'm running).

http://www.240edge.com/performance/r-u-arm-cusco.jpg

Much heftier. Mine survived a 25mph+ impact with a pole.

But see you get what you pay for.

[hellion240sx]

or you can stop running into poles at 25+mph lol :D

[mad-ass]

I'd rather have the RUCA brake on me when I hit something that retarded then to..i unno. brake my wheels or have a bent frame or subframe.

[axiomatik]

Different designs huh? You don't say.....

One has two tubes the other only has one? Golly gee I didn't see that.

You said you don't know what my point was, and then you basically just restated what I said, in more depth.




:mepoke:

Cusco/Kazama/PBM/SPL all use single tube design. But then again, I mean, y'know it doesn't mean it's stronger or anything, those companies don't know shit about R&D.

I forgot about this thread. You are obviously not an engineer. If you can't see why the CS design can use smaller diameter tubing and still be sufficiently strong, I am not going to keep debating this.

[gots13?]

Great can't wait to buy the package from phase2.. I wanted to go kazama but to pricey lol..

[illvialuver]

I like how some one was comparing these to bc, its like turds compared to turds. I am interested to see how well these hold up.

Also for the person mentioning dropping their car to the ground, check out cks suspension, same supplier as 326 power( you should know what that means), I have them on my 13 and I have them set as high as they can go in the rear, ( I did say as HIGH) and the car still sits within an 2 inches off the ground, and I could drop it another 4-5 inches in the rear, super slam retarded abilities. And they ride great, I am looking into swapping in some swift springs, and then I believe it will be the best coilover I have ever driven on.

Not trying to thread jack, just adding a response to help with the lowness.

[ryandriftingfat]

Thanks OP for the review. I ordered a similar setup from Phase2 (C2 track coilovers and all the arms).

Wayne and I discussed these a while back, but I hadn't really heard anything about them. I've been dealing with him for long enough now that I trust pretty much all the advice he has to offer, but it's still nice to hear other peoples reviews and comments. I received all the arms already and they look really nice. Can't wait for the coilovers to arrive!

<3 Phase2

[FoNzOs13]

Good Man!
So you said the rear doesn't drop at all i am currently on tien super drift...I was looking into getting the CS Coils. i am currently on oem 350z wheels...im guessing my car is going to sit very HIGH?
Give me feed back I'm picking up could this friday...

[s13 @ fullboost]

from the grave man haha

[dorkidori_s13]

Good Man!
So you said the rear doesn't drop at all i am currently on tien super drift...I was looking into getting the CS Coils. i am currently on oem 350z wheels...im guessing my car is going to sit very HIGH?
Give me feed back I'm picking up could this friday...


sorry man, cant be of much help to you there. im still running stock zenki teardrops, dont have any plans for 17s or 18s anytime soon.

[jptalaga]

Great write up man, this is awesome. ive been saving up for these coils for my s14 for the last month. (poor college student lol) but yea im definitely going to get a set of these when the time comes. and im gonna get their tension rods, my caster is all fucked up lol.

[ryandriftingfat]

Here are my rears straight out of the box. Haven't adjusted anything.

http://givemeshred.com/wp-content/uploads/2012/01/givemeshred-s13-rear-suspension-done.jpg

[yingiang]

i broke my CS RUCA on my S14 going over a rail road track at less than 5mph... fucking sucked.

[DJ-of-E]

Show pics of damage. Bad weld or something else?

[Nicelyphe]

Thinking of grabbing that arm package actually. I wonder how they would hold to the terrible roads of PA

/suscribed

[dorkidori_s13]

Here are my rears straight out of the box. Haven't adjusted anything.

http://givemeshred.com/wp-content/uploads/2012/01/givemeshred-s13-rear-suspension-done.jpg

thats what circuit sports look like on 17s??? thats actually not as bad as i thought they would be...but i personally still want to sell mine and get some PBMs (fuking MANLY suspension heheheh)

[ryandriftingfat]

thats what circuit sports look like on 17s??? thats actually not as bad as i thought they would be...but i personally still want to sell mine and get some PBMs (fuking MANLY suspension heheheh)

For the sake of totality, my rear sus mods are:

all other CS arms
SPL solid bushings fully raised.
stock axles
stock knuckles
stock LCA's with Moog ball joints
no spacer
17" wheels with 215/45/17 federal ss595's

alignment is god knows what. I took them out of the box and put them on my car. I don't have a clue what they are, just needed to get the car off jack stands. they are the C2 track version coilovers if it matters.

[phase2]

i broke my CS RUCA on my S14 going over a rail road track at less than 5mph... fucking sucked.

Send us some photos how they break, we can have Circuit Sports warranty the RUCA's. Although it is not common for the arms to break at only 5mph over the railroad track so we are curious to see what went wrong.

[godrifttoday]

I bet his rods seized!

[DoobieS13]

im about to get some tension rods(since i broke one of my tien's). anyone using them?

[dorkidori_s13]

im about to get some tension rods(since i broke one of my tien's). anyone using them?


please see first post in thread...

http://zilvia.net/f/chat/400989-circuit-sports-coilovers-arms-review-thread.html#post4187907

[g2ic02]

so no pictures of the broken ruca??? I may be thinking wrong here, but if i hit something shit is going to bend. I would personally rather a $120 arm break rather than bend something that is not as easy to replace(frame mounting point, knuckle)

[statusone]

Don't know what your point is. They have completely different designs. The Cusco/Kazama have to be much thicker because they have only one tube instead of 2. Doesn't mean that it is stronger.

Traditionally control arms and end links are actually designed to be fairly ductile in order to translate the impacts into bending less expensive components such as the links/control arms themselves than your knuckles and frame. That and having a ductile material also allows the product to bend rather than snap when deformed, allowing you to move your misaligned vehicle from the scene rather than loosing all control haha.

So technically, stronger isn't necessarily better, it is the marriage of strength vs. ductility, and of course dont forget weight!

[dorkidori_s13]

UPDATE 03-2014:
So almost 3 years later and the arms are holding up just fine! Car has been daily driven everyday since putting all the Circuit Sports arms on and theyve held up great! Ive since changed coilovers though. I swapped the CS coils for Fortune Auto 500 series as the FA's go much lower and are just an all around better product. Though, again, I will say that the CS Coilovers were a great entry level and affordable coilover. When I sold them, they were almost 2 years old and had zero signs of any problems! The CS coils were daily driven everyday as well so I can attest that Circuit Sports suspension parts are pretty damn decent for everyday use. How they hold up to heavy track duty, Im not 100% sure on, but if the wear and tear of everyday driving is any sign of quality, I bet they hold up just as well on track!