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210civic1 · **Posted:** Wed Jan 13, 2010 9:13 pm

i was just wounderin how much hp a full exhaust system with 4-1 headers and pretty much a straight pipe no cat would give me thanks

Integraguy04 · **Posted:** Wed Jan 13, 2010 10:00 pm

prolly around 10-15 bhp

ZCrxSiR · **Posted:** Thu Jan 14, 2010 6:07 pm

210civic1 wrote:

i was just wounderin how much hp a full exhaust system with 4-1 headers and pretty much a straight pipe no cat would give me thanks

It will be very loud, throw at least a resonator on there if your going to straight pipe ,u need a little back pressure for the low end of the rpm range. the 4-1 header is better for high rpm 4-2-1 in better in the midrange

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