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Old 01-21-2004, 06:27 PM   #1
jimtweet
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Default uppipe, downpipe, cat back....how much power gain?

can anyone tell me where to start...been in the VW world a long time and gettin read to receive my new 2004 wrx and wondering where to start with the engine...?
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Old 01-21-2004, 10:15 PM   #2
abqkid
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Hey,
A good starting place to build some power is the exhaust. Depending on what set up you go with a full exhaust system (up pipe, down pipe, catback) can give you anywhere from 30 to 40 hp at the wheels. The WRX looses a lot of power because it has 3 cats in the exhaust. Keep in mind that you won't pass an emissions test if you replace your up pipe and your downpipe. You will likely get a CEL (check engine light) as well. If you have enough money you should do all of these exhaust components at once as the installation for one component will usually incorporate the removal of another exhaust component. A good cat back will cost anywhere from 400 to 800 bucks. A good DP will cost around 200 to 300 and a good up pipe can be cheap if you simply want to gut your stock one. If not the they are around 150 to 300.
hope that helps
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Old 01-21-2004, 10:52 PM   #3
LotusDriftx
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THats the sixth time today I have read looses instead of loses on nasioc, its a freaking plague I tell you.

If you check this thread:
http://forums.nasioc.com/forums/show...hreadid=170789
you will find all of your newbie answers, and come back with any specifics you might have and someone will gladly answer them. A little searching goes a long way around here, theres just an insane amount of information.

I haven't seen a dyno result with full exhaust and no ecu reflash but I imagine its somewhere around 250. You should definitely get a reflash though; favorite turners include Cobb (cheapest), Turbo XS, and vishnu. This is commonly referred to as a stage 2 setup (cobb and txs), where as its a stage 1 with vishnu. You should get around 290-310 with these setups.

http://www.vishnutuning.com/
http://www.cobbtuning.com/
http://www.turboxs.com/

Last edited by LotusDrift; 01-21-2004 at 10:59 PM.
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Old 01-21-2004, 11:13 PM   #4
abqkid
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Thanks for the correction man that was my bad.
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Old 01-22-2004, 10:56 AM   #5
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Sport compact car dyno'd a WRX with just a full exhaust back on october 01, but the article isn't on thier website. It was Gary sheehan's touring WRX. If I remember I'll check out what numbers they got.
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Old 01-22-2004, 02:42 PM   #6
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What is this engrish crass??? Nternet is the land of poor grammor and mispeled werds.
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Old 01-22-2004, 10:26 PM   #7
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If you are on a budget, start with the uppipe. It will allow the turbo to spool faster, add milage to each tank of gas, and just makes the car a whole lot of fun. BEST bang for the buck!

Make sure you get one thermal coated like my Crucial Racing uppipe. Keeps the engine back 30% cooler and allows about 40% more heat energy to drive the turbo.

You will also want the downpipe coated to help keep engine bay tempatures down. You want the heat in the turbo, not under the hood. Coating helps keep it in the pipe, hence moving the heat out the back.

-Valhakar
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Old 01-22-2004, 11:21 PM   #8
Xman23
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Quote:
Keep in mind that you won't pass an emissions test if you replace your up pipe and your downpipe.
I read the up and downpipe FAQ and was under the impression that if you replaced both but left the 3rd cat in the exhaust that you WOULD pass emissions. What's the point if it wouldn't pass? Is everyone here rich and building an off road rally car?

Anyone have *firsthand* experience with an up/downpipe replacement and emissions testing??
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Old 01-22-2004, 11:30 PM   #9
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Ask your emissions questions in your local forum!!!! Advice given here from someone in Texas about emissions may not apply where you live. Ask local or suffer some unpleasant stuff at your local emissions facility!
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Old 01-23-2004, 12:08 AM   #10
Xman23
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Well, I was hoping for responses from anyone in the US, from anywhere, with any firsthand input. I realize the laws vary from state to state. Anyone who has replaced an up/downpipe but retained the rear cat...

Since you're from VA beach, and I believe you were the one who wrote the FAQ, and I'm from Delta Charlie (DC), you could answer my question better than anyone <s> I say DC when people ask where I'm from because I've moved back and forth from MD to VA so many times...I'm back in VA now. Who better to ask? You or anyone else in the US...
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Old 01-23-2004, 02:27 AM   #11
abqkid
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I can't vouch for replacing all of the cats except the 3rd as i have taken them all out but, what i do to keep from the emissions test is i register my car in a near by small town that has no emissions requirements. All i do is get a p.o. box in the small town and now i have an "address" there where i can register my car to.
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