What size downpipe for my perrin exhaust?
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Registered User
Joined: Nov 2007
Posts: 328
From: Sacramento
Car Info: 2006 Subaru WRX STI
What size downpipe for my perrin exhaust?
I have a 2002 wrx stock.I have a Perrin twin catback exhaust, what size down pipe is recommended? Someone is selling a 3 in one for my car. Would that size be ok with the exhaust? I plan on moderate mods in the future.
Last edited by KingJeff; May 2, 2008 at 05:00 PM.
Registered User
Joined: Jul 2007
Posts: 375
From: in a grass hut on the mountains next to Walmart
Car Info: 05 Aspen White STi wid 2 AK47's in da trunk!
i have a bellmouth which tapers from 4 to 3 inches on mine with a VF34 and no cats and my wastegate flutters like a ****. watch out for that flutter man! and the boost spiking........i need to port my wastegate but oh well!
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Joined: Mar 2004
Posts: 208
From: North Bay
Car Info: 02 Bugeye STI, 07 Forester XT 18GXT-R
Pretty much every exhaust is the same. The only difference you will ever see is in the DP [3"-4"], and mid-pipe back exhaust piping [3"-3.5"]. Aftermarket-wise it doesn't really matter.
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