STi Catalytic converter quesitons?

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09-06-2003, 10:56 PM

Sti-nkinPhast

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STi Catalytic converter quesitons?

how many cats are in the exhaust system?

are there 2? is there one in the uppipe?

one in the downpipe(precat)/ and one in the muffler (maincat)?

and if you take all of them out and replace with a nice exhaust set-up , how much performance gains do you get?

also do you need a boost controller for these mods?

09-07-2003, 11:20 AM

illmatic

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Oops thats the WRX. The STi has *to precat(before the turbo)

*oops again to is no

Last edited by illmatic; 09-07-2003 at 10:41 PM.

09-07-2003, 04:53 PM

Sti-nkinPhast

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thanks soooo much for this beautiful diagram....it can be considered "a piece of art"

wait, so the STi just has 2 cats then? one in the precat and on near the midpipe?

09-07-2003, 05:49 PM

teiva-boy

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Join Date: Nov 2002

Location: San Diego

Posts: 1,780

Car Info: Boosted Geo Prizm

STi = no pre-tubo catalytic
standard post cat's apply

09-08-2003, 06:16 AM

Sti-nkinPhast

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so get a down pipe and mid-pipe,(to gut both cats) and maybe a 3" exhaust and you should be cookin up some good HP gains?

if so, sounds like the next reasonable move