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Old 12-17-2002, 01:59 PM   #1
wrexsta
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Question Full Turbo-back Exhaust = uppipe, downpipe, cat-back?

I am confused about what a wrx exhaust system consists of? If I bought an aftermarket up-pipe, downpipe, and cat-back...would it be the same as buying a full turbo-back exhaust system? I'm very confused.
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Old 12-17-2002, 02:03 PM   #2
sliver
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turbo back consists of stuff "behind the turbo" . That would be ... downpipe/catback. The uppipe is pre-turbo so is not included in such a kit.
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Old 12-17-2002, 06:56 PM   #3
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So... if I just bought an aftermarket cat-back and downpipe.. it would be a full turbo-back exhaust system? Would a HKS downpipe and Apexi GT-Spec cat-back be as effective as buying a turbo-back exhaust system?
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Old 12-17-2002, 07:14 PM   #4
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Yes a catback and downpipe = turbo back exhaust.
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Old 12-18-2002, 06:42 AM   #5
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yea itd be the same thing, i just got my HKS downpipe in a few days ago, did anyone notice by the wastegate the pipe is 2.5" the as it goes down gos to 3"?
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Old 12-18-2002, 10:24 AM   #6
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Up-pipe is before the turbo.

D/P + Catback = Turboback.
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Old 12-18-2002, 11:53 AM   #7
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Here is a really playskool drawing of our system:

edit: i'll hook up the paint drawing, my text drawing didnt come out right

Ok here is a picture I whipped up. It shows where all the cats are (there are 3) and how the air flows. Hope it helps.


Last edited by industrial; 12-18-2002 at 12:28 PM.
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Old 12-18-2002, 09:39 PM   #8
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Ok.. thanks for clearing everything up for me. My next question is: do you guys know what is the best cat-back/downpipe combo?
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Old 12-18-2002, 10:44 PM   #9
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Quote:
Originally posted by wrexsta
Ok.. thanks for clearing everything up for me. My next question is: do you guys know what is the best cat-back/downpipe combo?
There are lots of possibilities, but you're gonna have to read the posts here and decide for yourself what's best for YOU, considering the factors that matter to you.

I picked the MRT turbo-back, but it's too quiet for some. Not too quiet for me, though. It also will pass the tailpipe test and not throw codes. Other systems can give you problems with those issues. So i settled for less power (compared to the TurboXS Stealthback) based on that tradeoff. There are other suppliers and they'll all have different prices, materials, and performance (low and high end). Take your pick. One reason there are so many options is that there's no clear "best" that's right for everyone.

If you're on a tight budget and you don't care about the loud noise and don't have to pass an emissions test and don't mind fooling the ECU into not throwing codes, the far cheapest way to get more power is to completely remove the stock up-pipe and turbo-back and gut all the cats and the muffler ... so the system *looks* stock but sure won't sound stock. The cost? Just your labor time. And of course it'd only be legal for off-road use.

I gutted both cats on the car i used to have and the engine computer adjusted to it just fine, but have no idea how to gut the WRX stock muffler ... you may have to break it open and then weld it shut when done with it. But the muffler is the cheapest exhaust piece to replace, so if you're going the cheap route you might as well just buy a new high-flow glass-pack at most any muffler shop and have them weld it on and weld on the hangers if it doesn't fit the stock mount points. A muffler shop can do amazing things if they know how to do good welding.

Last edited by dave_the_driver; 12-19-2002 at 01:15 AM.
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Old 12-18-2002, 10:53 PM   #10
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None of you have the breakdown of the exhaust right yet. It goes like this. Starting from the exhaust ports.

-Exhaust manifolds
-Up-pipe
-Turbo
-Downpipe (cat)
-Front mid-pipe (cat)
-Rear mid-pipe (resonator)
-Muffler


Cat back= rear mid-pipe + muffler.

Turbo back is self explanitory.
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Old 12-23-2002, 01:47 AM   #11
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Ok.. I have finally decided on the Perrin downpipe (no cat) and the Tanabe Super Racing Medalion. Thanks for everyone's help, but I got one more question. What is a resonator? What does it do?
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Old 12-23-2002, 02:08 AM   #12
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Resonator is a fancy name for a fancy muffler.
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Old 12-25-2002, 06:41 AM   #13
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Wow, all in all, very informative..

but what about an N/A car WITHOUT a turbo..?? How does their exhaust system work?

Can any1 take a 2000 Integra LS or like a 2003 Eclipse GT and tell me how the exhaust system is like there?? I would love you for it!!

and what about other turbo cars such as an Eclipse GS-T? Do those cars have up-pipes -> turbo -> DP -> catback systems as well??

Thanks alot!!
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Old 12-25-2002, 07:18 AM   #14
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not quite sure I understand your n/a question...they go header ---> pipe w/cat --> catback

turbo cars generally dont have an uppipe, the header just flows into the turbo.
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Old 12-25-2002, 04:59 PM   #15
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Quote:
Originally posted by mlambert
not quite sure I understand your n/a question...they go header ---> pipe w/cat --> catback

turbo cars generally dont have an uppipe, the header just flows into the turbo.
OOic.. hmm.. then if one were to upgrade the exhaust system for an N/A car.. what would he have to change for a full upgrade?? would a cat-back system be enough or can u change the pipe w/cat as well for performance increase.. and what IS that pipe w/cat called.. would it be a midpipe like in our WRXs?
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Old 12-25-2002, 08:13 PM   #16
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supermarkus said it already...

Um.. am I the only person who sees a problem with what all of you are saying. The stock exhaust peices, are made up of 4 individual peices.

Downpipe (cat #2)
Front Mid. Section (cat #3)
Back Mid. section (resonator) not the same as muffler
Axle Back section (muffler section)

If you buy a down-pipe and a cat-back, well... if you can't figure that out. I pray that you won't deside to take a bath with a toaster too.

Don't try to go the cheap way. Buy a full system if you are thinking about it. A full exhaust was engineered as a full exhaust. If you have a HKS downpipe, stock front mid section, and a Stromung rear mid sectiom, with a Prodrive muffler. NOTHING WAS DESIGNED WITH THAT CONFIGUATION IN MIND! Plus you are gonna have some fitment issues.

Rich
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Old 12-26-2002, 03:02 AM   #17
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Quote:
Originally posted by SJwrx
supermarkus said it already...

Um.. am I the only person who sees a problem with what all of you are saying. The stock exhaust peices, are made up of 4 individual peices.

Downpipe (cat #2)
Front Mid. Section (cat #3)
Back Mid. section (resonator) not the same as muffler
Axle Back section (muffler section)

If you buy a down-pipe and a cat-back, well... if you can't figure that out. I pray that you won't deside to take a bath with a toaster too.

Don't try to go the cheap way. Buy a full system if you are thinking about it. A full exhaust was engineered as a full exhaust. If you have a HKS downpipe, stock front mid section, and a Stromung rear mid sectiom, with a Prodrive muffler. NOTHING WAS DESIGNED WITH THAT CONFIGUATION IN MIND! Plus you are gonna have some fitment issues.

Rich

Nice explanation!!

But now that makes me have yet another question.. a "cat-back" system starts from WHICH cat? the #2 Cat or the #3 Cat?

SO much info in this one thread.. i'll point it to every n00b that has questions about exhaust (n00bs like me )
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Old 12-26-2002, 05:19 AM   #18
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A cat-back will be from the farthest towards the back (closets to the butt of the car) and back. It will not replace a cat, it will only be the piping and muffler on that section.

Don't even start to worry, apoligize, or anything about asking newbie questions. I was a newbie once, and so was everyone else. Just please remember that at the top of the screen is a "search" button.

Rich
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