Quote:
Originally Posted by vinhisbored
Not true. As stated, me and my friend both have the same exhaust. HKS CF/Ti Tip. I have 3" straight piping, and he has 2.5" straight piping. His exhaust is louder than mine, and we both are running stock ka24de's with no modifications. Also.. one of my friends have an Apexi GT Spec exhaust.. (3.74" piping) and he has no back pressure..
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Again. Let me see that you've measured your friends backpressure.... A GT Spec is just plain big on a NA engine. It's about the VELOCITY of the gas.
