hollow out catalytic converter

[Gordo714]

have my exhaust off right now and was thinking about hollowing out the CAT but dont know what it would be like. i already tried a test pipe did not like it becasue it leaked now i want to try this any input will help

will it sound deeper or more raspy like a Honda???

ps. stock exhaust. not after market at all

straight OEM lol

thanks

[Tenchuu]

what engine? but generally no, stock S14s have a hollowed out car factory, but a big ass one in the DP

[Gordo714]

its on a KA n/a i am sitting here in my garage debating on doing it or not

[Jonnyblaze]

Don't get caught. That's highly illegal.

[midnightouge]

Sell it and buy a test pipe.

[Gordo714]

yeah i know its illegal but not as illegal as driving with out anexhaust for the past 2 days pretty sickky but way to much attention

na test pipe is ruled out already had one.

[lflkajfj12123]

i drove without an exhaust for almost a year

never got bothered for it

[Jonnyblaze]

A test pipe is better. Just install in correctly next time.

[Gordo714]

where do you live though?

[Gordo714]

im over it so cal sun is to nice going to the beach laaaaate check thread tomorrow and thanks to everyone

[The Chad]

hollow it out if it is not already from factory. I noticed very little difference in sound when i installed my Hotshot 4-1 headers/cat delete. That stock muffler eats up all kinds of engine noise! :)

[ixfxi]

dont do it on an NA car... even on a turbo car, i wouldnt do it.

[Anto]

wtf.. dont do it on a stock exhaust

[GSXRJJordan]

Keep the cat intact, use a resonated test pipe with the correct gaskets - it won't leak, will sound better (deeper), and throw that cat back in for smog.

[Stratokat]

Keep the cat intact, use a resonated test pipe with the correct gaskets - it won't leak, will sound better (deeper), and throw that cat back in for smog.

what he said

[z2roll4life7]

Hollowed out Cats have been proven to make LESS hp get a Test pipe and bolt it up right will make more power N/a or Turbo

[The Chad]

well here in VA we don't have to pass any kind of smog...sooo when the cat goes bad, it's a big money saver to just gut the catalyst :) And I noticed little to no difference in power plus or minus.

[ixfxi]

what is the fucking point of running w/o a cat?

it doesnt make a fuck worth of sense.


some things like EGR or charcoal canister, i give a fuck about. but things like the cat is NECESSARY on like, 99% of the cars out there (minus race-cars, imo). so seriously, what are you gaining for the amount you are polluting? run a cat and quit being a pussy.

[genericforumname]

I agree I have a video of the 800+hp top secret skyline only making a difference of 8hp on a dyno when switching from a test pipe to a high flow cat, if you do anything just buy one of those, plus your car stays legal. Besides if your on stock exhaust anyway power obviously isn't super high on your car anyway so why bother?

[ixfxi]

omoogmogmogmomgomogmogmomgmgomgoogmomgomomgoomg!!! !

i neeeeeeeeeeeeeeed that EXTRA 8hp to win my street races, y0!!!!!!












seriously.

[Sileighty_85]

Gutting a cat on an N/A does you no good at all it actually hurts you
I have seen many Articles of ppl dynoing a stock cat, gutted cat and a test tipe

from what I've read On N/A cars
Gutted cat will you cause you too lose power due to the turbulence created in the cat causing back pressure
a test pipe gives you about +1 hp

I cant imagen it being that much more on a turbo'd car

So its really not worth fucking with

Im with Mike leave it alone

[racepar1]

Hollowing out your cat is not a good idea. First off your car will sound like shit, and second it restricts flow (possibly more then a cat does) due to what a big empty chamber does to the airflow through it.

[HYPNOTIK]

Gutting a cat on an N/A does you no good at all it actually hurts you
I have seen many Articles of ppl dynoing a stock cat, gutted cat and a test tipe

from what I've read On N/A cars
Gutted cat will you cause you too lose power due to the turbulence created in the cat causing back pressure
a test pipe gives you about +1 hp

I cant imagen it being that much more on a turbo'd car

So its really not worth fucking with

Im with Mike leave it alone
^I agree^
http://www.zeroyon.com/forums/uploads/post-5654-1235901510.jpg

[sliksta1]

just leave it alone. nuff said.

[DDDsquad_s13panda]

im runnin gutted cat to 2.50in. piping to greddy.

my car dont sound like a honda with an APEXi but its almost up there..

dont like it what so ever. but i have n choice. my cat was all busted up inside holding up way too much backpressure causing the bolts to loosen and fall on the freeway, next thing you know, i was on open header draggin my exhaust.

but id get a cat. OEM if you can get one. the aftermarket once the muffler shop sells are booty. besides the magnaflow high flow cat.

but yeah oh btw, i have N/A SR20DE.

[drifter_for_life06]

catco high flow FTW

[murda-c]

no cats will make your car smell funny.

[timmigans]

i hollowed out my cat. welded a pipe on the inside so it looks legal. runs fine and sounds fine. but thats in new york. we dont have smog tests like you do in cali.

[HYPNOTIK]

i hollowed out my cat. welded a pipe on the inside so it looks legal. runs fine and sounds fine. but thats in new york. we dont have smog tests like you do in cali.

This is also a good option, just as good as a test pipe.

[The Chad]

Join me!!! East Coast unite and trash the environment! (kidding) haha I know not having a catalyst on a car is bad for the environment. I know of the limited gains or even negative numbers one may see on a Dyno. But when my cat started smelling like rotten eggs on my S14, i finally put on my Hotshot 4-1 (deletes cat) and no more smelly exhaust and much cheaper (free) than the $$$$ stock cat. I'll stop saying it's ok to do i guess :( I was outnumbered. I really just didn't notice any difference in sound or pick-up soooo I just figured that it was a great alternative to replacing more $$$ parts?

[ixfxi]

im runnin gutted cat to 2.50in. piping to greddy.

my car dont sound like a honda with an APEXi but its almost up there..

dont like it what so ever. but i have n choice. my cat was all busted up inside holding up way too much backpressure causing the bolts to loosen and fall on the freeway, next thing you know, i was on open header draggin my exhaust.

but id get a cat. OEM if you can get one. the aftermarket once the muffler shop sells are booty. besides the magnaflow high flow cat.

but yeah oh btw, i have N/A SR20DE.

Join me!!! East Coast unite and trash the environment! (kidding) haha I know not having a catalyst on a car is bad for the environment. I know of the limited gains or even negative numbers one may see on a Dyno. But when my cat started smelling like rotten eggs on my S14, i finally put on my Hotshot 4-1 (deletes cat) and no more smelly exhaust and much cheaper (free) than the $$$$ stock cat. I'll stop saying it's ok to do i guess :( I was outnumbered. I really just didn't notice any difference in sound or pick-up soooo I just figured that it was a great alternative to replacing more $$$ parts?

wow, you guys were just made for eachother.

100-200 bucks is a drop in the bucket for a high flow. man up, pusscakes

[racepar1]

wow, you guys were just made for eachother.

100-200 bucks is a drop in the bucket for a high flow. man up, pusscakes

SERIOUSLY! A decent 240 has probably about $7,000-$10,000 into it and peaple bitch about $100-$200? That doesn't make any sense. If $100-$200 is a lot of money to you you shouldn't be modifying ANY car.

[The Chad]

wow, you guys were just made for eachother.

100-200 bucks is a drop in the bucket for a high flow. man up, pusscakes
I wish I had a come back...hmmm... YOU ARE!! haha lol. I know. I need to man up. One day i'll realize that my car is more important than beer, but untill that day...my S14 will live Cat-less :):spank:

[lflkajfj12123]

SERIOUSLY! A decent 240 has probably about $7,000-$10,000 into it and peaple bitch about $100-$200? That doesn't make any sense. If $100-$200 is a lot of money to you you shouldn't be modifying ANY car.

jeah

http://sopemag.com/1.jpg

[Matej]

You can get 100$ for a 240 catalytic converter at places that buy them up.

However, I hollowed out my converter, before I was aware I could have gotten money for it. I did not notice any sound difference, and I do not know if it made any power difference, but I do not care about horsepower anyway. What it did do was made my car run a lot cooler, and my floor stopped getting hot. That was nice.

I would probably still be running the hollowed out converter, but one of the bolts on it broke off.

Now I have a 2.5" header going to a 3" test pipe mated to a stock catback, haha.

[ixfxi]

eBay Motors: Random Technology high flow cat Evolution VIII Turbo (item 270360241230 end time Mar-24-09 18:49:29 PDT) (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=270360241230)

cant........................... afford................ high.............. flow..............!!!!!

tooo........... much.............. money!!!!!!

im running a NEW random technologies cat which i got for cheap, that was years ago. above is a link on ebay for a used cat that will be fine for anyone running an sr20det. as a note to people that stumble into this thread 3 years ago when the ebay link is dead, the link was for a used 3" random technology cat that was used on an EVO, its even got the flanges.. what more do you need? 75 bucks buy it now.

whoop-dee-doo. sit in an underground parking lot for a few minutes and remind me how fun and cool it is to be w/o a cat.

like i said, things like charcoal canisters and egrs i dont care for.. but cats are necessary in todays world.

[DDDsquad_s13panda]

yea iono if you guys THROUGHLY READ MY POST. IT WASNT MY CHOICE TO GUT MY CAT but i jst had to. at the moment i have no job or money.

But like i stated "i dont like it what so ever and i would get a cat"

not now maybe later.

thanks for reading douchebags!!! =]

oh and like i said before. buying an aftermarket CAT @ a muffler shop is booty.$110/each x3. OBVIOUSLY i tried cleaning out my car by putting a cat. one after another, shit jst gets torn apart inside. dont know why.

If your gonna be a tree hugger about it, then YOU SHOULDNT MODIFY ANY CAR!

get a prius.

thanks for playing

[MrChow]

eBay Motors: Random Technology high flow cat Evolution VIII Turbo (item 270360241230 end time Mar-24-09 18:49:29 PDT) (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=270360241230)

cant........................... afford................ high.............. flow..............!!!!!

tooo........... much.............. money!!!!!!

im running a NEW random technologies cat which i got for cheap, that was years ago. above is a link on ebay for a used cat that will be fine for anyone running an sr20det. as a note to people that stumble into this thread 3 years ago when the ebay link is dead, the link was for a used 3" random technology cat that was used on an EVO, its even got the flanges.. what more do you need? 75 bucks buy it now.

whoop-dee-doo. sit in an underground parking lot for a few minutes and remind me how fun and cool it is to be w/o a cat.

like i said, things like charcoal canisters and egrs i dont care for.. but cats are necessary in todays world.
Holy cow that's cheap. I got my high-flow cat magnaflow for $86 plus what it cost to get it weld so like $120. That's a great prices for a random technologies cat.

I car actually feel better when I added the cat. Just to note I have an S14 so I added another cat so now I have 2 cats. But the car feel just has good.

[Gordo714]

yeah i knew it wasnt a good idea just wanted some input and it helped thanks once again

[boske]

I'm pretty sure a 2.5" pipe fits nicely through the factory cat shell.

[bl3ujay07]

hey ixfxi, is the random technology cat the same length as stock 240s? I have a stock cat, but am trying to get a 3" one. Any modification to the cat needed for the sr people?

[nismoskyz]

best cat.


http://img22.imageshack.us/img22/2725/img2566q.jpg

[Matej]

best cat.


http://img22.imageshack.us/img22/2725/img2566q.jpg
Are you going to hollow it out?

[nismoskyz]

lmao. i had the same thought going through my head. I guess it would bring about the more physical meaning to the process of "gutting".

but to answer your question, no!

[gotspins13]

Sell it and buy a test pipe.

or keep it and get a test pipe cus you will need it later for smog,
i dont think doing it would make much of a change and you would be throwing away a good cat.
i vote no.