I just got A 99 si and i absolutly love the car. Im conteplating what to do first and im looking into full exhaust. What are some exhaust for civics that dont sound really loud and raspy as alot of them i hear running around here do. And what type of hp gains can i expect from headers and full exhaust?

 

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Intake / Header / Exhaust will net you anywhere from 10-20 hp when installed together, but it won't give you much torque. Forced induction is the only way to make power with these sub 2 liter engines.

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