engine back exhaust

[johndleahy]

wut are the hp gains with headers, up pipe, turbo back exhaust, and the
much debateable cai? anyone have the figures its turbo xs turboback,
hks up pipe and aps headers, and aem cai.

 

[xblazinlv]

It varies vehicle to vehicle, what kind of boost would you be putting
through the motor with thos emods? Stock levels or higher?


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[Philip Procter]

It's very different between, say, a WRX and an STi. The WRX has a much
more restrictive exhaust due to the cat in the downpipe. The numbers
I've seen for the WRX are on the order of 30+HP from the combination
of an engine back and chip upgrade

Not sure a COI does much alone, but it may help an overall upgraded
engine. It sure makes the intake MUCH louder!

Philip