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Old 04 Sep 2009, 10:30 PM   #1 (permalink)
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Exhaust

Guys i have a silly question? I drive 2008/09 wrx sti and would like to change form the stock to a performance exhaust. Do you have any recommendations for you'll experiences? and do I have to remap my ECU or any of that major stuff?. Also would my hp increase any?. And what on earth is a "cat back" exhaust. Thanks in advance.
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Old 05 Sep 2009, 12:39 AM   #2 (permalink)
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Re: Exhaust

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Originally Posted by glyne View Post
Guys i have a silly question? I drive 2008/09 wrx sti and would like to change form the stock to a performance exhaust. Do you have any recommendations for you'll experiences? and do I have to remap my ECU or any of that major stuff?. Also would my hp increase any?. And what on earth is a "cat back" exhaust. Thanks in advance.
A cat back exhaust is an exhaust going from the cat back to the rear of the car with cat still in place, then a de-cat is when the cat is taking out and replaced with a straight through pipe if you just wana go with the back boxes you dont need a re-map but if going for a cat back exhaust and further mods a re-map will be essential also going for a de-cat a re-map is also a must as free flowing exhaust will cause the turbo to overboost, could see 20-25bhp gains
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Old 05 Sep 2009, 06:38 AM   #3 (permalink)
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Re: Exhaust

spot on mate. :-) the term catback is catalystic coverter back , and as said above
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Old 05 Sep 2009, 09:00 AM   #4 (permalink)
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Re: Exhaust

I agree with whats been said about zorsts but not overboost problems, Id read all about it before I did mine but tbh it was spot on before it was mapped(30bhp increase), I had it checked on the rollers for boost/fuel and power, I think the problems were with the earlier JECS ecus not being that clever, The later Denso is a totally different ball game, a bit like playing games on a zx81 and then jumping to a PS3, Its always worth a map to get the most out of any mod but I do feel sometimes there are some Myths on subarus that get handed down from generation to generation.
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Old 05 Sep 2009, 07:40 PM   #5 (permalink)
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Re: Exhaust

Thanks guys
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Old 05 Sep 2009, 07:41 PM   #6 (permalink)
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Re: Exhaust

Do you have any recommendations in terms of manufactures?
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Old 06 Sep 2009, 06:52 AM   #7 (permalink)
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Re: Exhaust

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Do you have any recommendations in terms of manufactures?

Link:1 CobbTuning.com - SS 3" Downpipe

Link:2 2008+ WRX/STI Exhaust - Exhaust
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Old 06 Sep 2009, 07:19 PM   #8 (permalink)
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Re: Exhaust

Subaru Performance Exhausts
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