Exhaust Question.

[radrex88]

Ok I bought my hi power exhaust about a year ago, and its really nice, but too quiet for me. So I took the rear section off, and of course its louder cause all im running is the resinator, now I was wondering, could this be the cause for the sudden lose of my low end torque.

[TNathe]

In a word, YES! Why'd you take the muffler off? You should have removed the resonator instead. Still would have lost a little bit of low-end probably but it would definatly sound better. Just my $.02

[radrex88]

Thanks, thats what I thought, Im going to put it back on tomorrow. Oh and the resinator isnt removable, so I need to get a new mid section.

[TNathe]

If you know of a competent welding shop in your area they can cut the resonator out and replace it with just a straight piece of pipe.

[TNathe]

I just bought an HKS Hi Power Exhaust an installed it on my car. The guys at my local performance shop said that HKS doesn't make a Hi Power exhaust bigger than 2.5 inches, which is what is on my car now. You have an SR swap in your car correct? I thought on turboed cars you didn't want to go with an exhaust smaller than 3" due to the restrictiveness of a 2.5" pipe. I would like to do an SR swap into my kouki but don't really want to have to replace my exhaust system. So maybe before you spend money at the welding shop having them hack a $600 exhaust system, maybe you should take the system off the car, sell it, and buy a 3" system. I would do more research though before taking my advice.:)

[TNathe]

:doh:Then again I see you are in Japan. Maybe you can get a Hi Power system from HKS that hey don't market here in the states.

[Phoen_x_s14]

Originally posted by TNathe
...I just bought an HKS Hi Power Exhaust an installed it on my car. The guys at my local performance shop said that HKS doesn't make a Hi Power exhaust bigger than 2.5 inches, which is what is on my car now...


Dude, don't you ever visit a website of the manufacture or atleast other sites and research before buying something that expensive like an exhaust? Not putting you down in anyway, but peeps need to know all about the products before purchasing, cuz I think that local shop of yours either was trying to get rid of their high stock of Hiper N/A model exhaust to you or something. Play it smart, some shops just want us to buy stuff they overstock on and sell it for more. I bought mine thru a hookup at the NOPI headquarter store. $450 HKS hiper catback, no tax :cool:. 240 exhausts sold @ nopi (http://www.nopionline.com/index.cfm?fuseaction=dspparts&vL1ID=0&makeid=270&modelid=120&catyear=1997&catid=0020&pcid=001&vTitle=1997%20NISSAN%20240SX%20Exhaust%20Cat%2DBac k%20Exhaust%20System&vaffid=0)


Ok 1st off there are 2 types of catback exhaust systems for the zenki/kouki 240sx made by HKS. Since our cars are made originally, well JDM cars, are made in Japan and either comes with the SR20DET or the SR20DE of course there's gonna be aftermrkt support for both N/A and turbo models. Dam Nissan USA for gibbing us with a truck engine.:cry: I guess no replacement for displacment even if it comes with turbo is the american way. sigh. I'd rather have a turbo engine, that I can boost the hell out of and put a stroker kit on.
HKS makes the Hiper (hi power) and the dragger cat back for our cars. Both come in N/A and Turbo specs. The Hiper Natural Aspiration spec (which I had previously, but sold) is 2.5" (63.5mm) inch piping and the tip is 4.5" (115mm). The turbo Hiper is around 3"(75mm) and the special anniversay hiper is 3.3" (85mm) of piping, both have a tip size of around 4.7" (120mm)

The Dragger comes in N/A and turbo forms too
N/a= 2.5" (65mm) piping with a 4.5" (115mm) tip
Turbo (Dragger 2)= 3.3" (85mm) with a 4.5" (120mm) tip

Most difference between the two is how it looks, when I had the HKS hiper, people thought I had the Apexi N1 on till they looked closer and saw the etched/engraved HKS HI POWER on the muffler canistor.

so research so you know what you get, buying stuff for your car just because its cheap isn't always good, cuz you might have something plan later down the road and you wont even be able to use what you have.

As for me, yippie I'm saving up for the Apexi R95 catback.
:drool:

[TNathe]

First, compliments on your sweet ride. I didn't buy the exhaust from my local shop, I bought it from someone on this forum. He was selling it for a hell of a deal brand new in box still, so figured wtf, I'll buy it since it will be a long while 'till I turbo the KA or swap an SR (still don't know what to do, too many conflicting preferences). But, yeah your right, there are too many people that don't do the research involved in making a purchase for their car, they just ask someones opinion and go slap down their hard earned cash. Anyways, to the point, I'm wrong and the cock heads at my local performance shop fed me bs.:mrmeph:

[ace004]

so in your guys opinion which exhaust puts out more hp
hks hi power
apexi gt spec
blitz nur spec?
I need to know what one work best obviously the apexi is gonna be the worst but by how far? also would a 80mm downpipe bolt right in or would I have to make alterations?
thanx for info

[Phoen_x_s14]

Originally posted by ace004
so in your guys opinion which exhaust puts out more hp
hks hi power
apexi gt spec
blitz nur spec?
I need to know what one work best obviously the apexi is gonna be the worst but by how far? also would a 80mm downpipe bolt right in or would I have to make alterations?
thanx for info


Well that depends, are you gonna keep the KA24, go turbo, or turbo engine swap? Cuz going N/A route, anything bigger then 2.5" (um 75mm I think) will decrease your low end torque but give you a lil bit more top end hp. So you better figure out or have a good idea on what your plans are. Don't be like me, buy something cuz of a friend thought it would look/sound good for your car. Looks only go so far...till another car dust's you :doh: dam wrx. But since you want a downpipe I'm guessing turbo.

I was planning on also gettin the GT Spec, but! It's a one piece cat back from the Cat. convertor, so just in case you get into a accident (like I did trying to drift at a intersection while raining :doh:x4) the pipe might bend, and that'll be a lil too much to repair a one piece catback that goes from 3"-3.5"-3.7". Just try to take that into consideration, lots of things happen we can't control. :sigh: :(

Um...Blitz nur spec works pretty good with the SR20's lots of Jap and Euro peeps have it on theirs, they have pretty good results in Hp gains.

Most aftermarket companys also have their own downpipes, but mainly for SR20, RB series. Not many for a KA. If sr20, should fit right in, but RB might have to get customized or shave it yourself with a dremel or grinder. But if you plan on buying a turbo kit, I think some come with a downpipe or frontpipe. I'm not sure if the downpipes for a SR20 would bolt in without probs for a turbo KA24, someone correct me on that on what you find out.types of 80mm downpipes (http://projectnissan.com/PRODUCTCART/pc/viewCat_h.asp?idCategory=4) hope that helps

Also where do you want the most power gain at, low, med, or high. I think HKS or Apexi makes a 4" one piece catback for the RPS13's (180sx/240sx hatchback) If you want more power I think in my opinon the Apexi GT spec would in top end power. Bigger cat back piping.

[ace004]

im going to put an redtop in my s13 and your right about project silvia thats the downpipe I was thinking about. so you don't think there would be a problem with fitment? also I want high hp gains so I would think the bigger the pipe size the better so I guess it cuts it down to the 80mm nurspec or the 85mm hks.basicly I want the most hp gains so what one would you prefer? thanx alot for your help

[Phoen_x_s14]

There shouldn't be a problem with fitment since your gonna use the S13 sr20. If you just want high top end power, I think the 85mm downpipe would be for you. OR if you really want to, theer are some company's who make front pipes. This basically is like a downpipe and straight pipe. so basically its a downpipe that meets up with catback. Not emission legal tho.

[ace004]

Do you know a website to one of those places that makes the pip straight form the down to the catback? I don't know if I trust what project silvia says. I went there today and I guess they stopped producing their 80mm test pipes and alo they said that they had greddy and blitz downpipes that were 80mm I thought they only came in 75mm. so I don't know whats up if im wrong or if project has the specs wrong?

[Phoen_x_s14]

I think http://www.heavythrottle.com/ has a test pipe for sale, $99. I think you have to call projectsilvia.com up, seems like they get lazy updating their website. Hmm I dunno if its 75mm (3 inches) or 80mm (close to 3.2 inches) its not that much difference. I think the specs are about right tho on projectsilvia.com

[ace004]

yeah see all you have to do to convert mm into inches is toi devide the mm by 25.4 and you get inches. which makes 75mm like 2.9 and 80mm lik 3.19 or something like that I just want my exhaust to be the same all the way through thanx for the info it helped out alot