Subaru WRX Forum

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-   -   Subie noob exhaust question (

Jcress12 11-09-2011 07:56 PM

Subie noob exhaust question
Hi guys I had a question about the whole exhaust set up. I just want to know how it all comes together like I am looking at people getting up pipes and then down pipes and I am not sure if you need an up pipe if you have a down pipe? Is a down pipe just a better version of a up pipe? Thanks

cwinterbower 11-09-2011 08:07 PM

Up pipe goes "Up" from the exhaust manifold/header to the turbo hotside, downpipe goes "down" from the turbo hotside to the catback. Up pipes on the earlier WRX's had pre turbo cat's in them hindering performance even further than the already restrictive up pipe, thus the reason most people with earlier WRX's replace both. Downpipe's are the real source of backflow issues for stage 2, which is the reason to replace downpipe's for stage 2. Hmm confusing post, bottom line no they are not the same.

Jcress12 11-09-2011 08:12 PM

Ok that clears it up a little for me, and ya it was confusing. Basically I was wanting to know if I was going to up grade my exhaust I could do an up pipe, down pipe and then the cat back right?

Vew 11-11-2011 02:53 PM

No reason to delete a thread just because the OP was answered. This way others can learn too.

To answer you last question, yes. Some companies will combine the down pipe and the cat back and call it a turbo back (everything back behind the turbo).

brfatal 11-11-2011 04:35 PM


turmic 11-11-2011 08:42 PM

Brfatal's diagram is for 02-05 WRXs [U]only[/U] (Read: Does not apply to STIs or any other year WRX) Because it has the UP cat....eliminate the UP cat and it pretty much is what other years look like. Minus the silencer for the 08+ WRXs.

brfatal 11-11-2011 10:19 PM

Last I checked the OP has an '03 ;)

turmic 11-11-2011 10:39 PM

Yeah, but other people will view this thread. !Thumbs Up

ejs0806 11-12-2011 02:31 PM

once you get under the car it all makes sense. I didnt understand for the life of me until i hopped underneith and it all fell into place

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