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mufflers just cause unnecessary backpressure which will rob you of power. a straight through 3" pipe is already inefficient at that hp level.
that's a nice rwhp number for a cam only car though. i have their 232/234 cam with their 5.3L heads and put down 414rwhp/385rwtq...although that is a bit low for an M6 car.
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1999 Black Z28 with go fast stuff
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