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What would happen if u disconnected the exhaust right after the catalytic converter? Would it give u more horsepower or would take away horsepower? Does anyone have a clue
i dunno, a common myth is less pressure = good, but for a typical 4 cyl/6cyl car u need 1-3 psi of backpressure, so runnin it open might hurt u bad and give u a bad headache :P