just a thought...

[b0r1cha]

so my friend just installed an exhaust on his STi. sounds like a typical sti nothing special but he took his cat converter off. i was wondering wat the pro's and con's are of doing that. of course the sound gets louder but wat else? i was wondering if i should do that to my camry. anyone have any suggestions? ideas? personal experience? thoughts? threats? flames? hahhaha anything is fine

[Tobeit]

Leave the cat in - its their for another purpose than just sound. If you want a louder exhaust - take the resonator out. That just increases the dB a bit w/o any harm to the catalytic converter function (it's a filter!!).

[Netforcer]

With it off, you lose a lot of back pressure, hence good if you go FI
Flow is smoothed out
Sound gets louder (raspy)
Earth dies a little quicker

if you want to do anything to your cat... get a hi-flow

[beave_au]

In Oz, if you get busted with your CAT removed, it's over $10k fine, I am sure you guys in the states would have similar fines for sure, I wouldn't be doing it personally.

[bigkidd]

In Ga $2,500

[Netforcer]

hence the hi-flow

[b0r1cha]

Originally Posted by Netforcer

hence the hi-flow

well when i went to get my mufflers done a while ago, the guy there said that all cars made after 95 or something had high-flow cats. o.O maybe i heard it wrong. buy any reccomendation on which cat to get? and well it affect sound? again pro's and cons please.

[w203]

Originally Posted by Netforcer

With it off, you lose a lot of back pressure, hence good if you go FI
Flow is smoothed out
Sound gets louder (raspy)
Earth dies a little quicker

if you want to do anything to your cat... get a hi-flow

how does it make the car lose a lot of back pressure? how is flow smoother? the cat does not effect any noise level but it is bad for the environment... btw the stock cat is not that restrictive. back pressure is negligible on a na car so even if mildly fi'ed the cat doesn't need to be switched out. taking out the cat does not change the exhaust tone, the resonator, diameter piping, and muffler does. but then again this is nothing technical just like the thread about the top speed right?

[t0eknee]

PLUS black smoke coming out making ur car dirty. my friend's evo is white, so it becomes noticeable after a couple days of flooring it.

pro-more power
cons - earth will die quicker!

[sex_&_TRD87]

and to simplify, u wont get passed for inspection correct? iono


but yea even for a newb (me) i wouldnt recommend or think about taking out my cat, resonator maybe (might take it off tomorrow) but yea, a cat-less setup is never a good way to go, street wise

[b0r1cha]

my resonator is already off. and i thought taking off the cat does affect the noise. it sure did for my buddies STi.

[MAP1234]

I had no cat on my last car (civic ex) for about 60,000 miles...always passed emissions...

[PRINCESS PEACH]

Originally Posted by MAP1234

I had no cat on my last car (civic ex) for about 60,000 miles...always passed emissions...

holy crap thats amazing lol. dang lucky haha

[b0r1cha]

wow... indeed that is pretty lucky. most of my friends put their cat on before they go for smog checks or go to places that'll pass them 8D

[wireless]

IIRC, a leaking cat will make more noise (exponentially) than no cat.
=Licking cat, not to be confused with leaking cat (not shown here)