Subie noob exhaust question - Subaru WRX Forum
 
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#1 Old 11-09-2011, 07:56 PM
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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
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#2 Old 11-09-2011, 08:07 PM
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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.
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#3 Old 11-09-2011, 08:12 PM
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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?
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#4 Old 11-11-2011, 02:53 PM
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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).

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#5 Old 11-11-2011, 04:35 PM
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#6 Old 11-11-2011, 08:42 PM
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Brfatal's diagram is for 02-05 WRXs only (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.

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#7 Old 11-11-2011, 10:19 PM
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Last I checked the OP has an '03
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#8 Old 11-11-2011, 10:39 PM
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Yeah, but other people will view this thread.

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#9 Old 11-12-2011, 02:31 PM
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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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