Originally posted by mrmike
its raspy/rattly/buzzy because ur forcing a lot more air through what i asume is a stock exhaust. Free up the flow with an exhaust and it will elliminate that rattle and probably produce a good hp gain.
My roomate had a test pipe on his apex n1 exhaust which is one of the most free flowing exhausts on the market, and his was still buzzy with a test pipe. Put the high flow cat back on, and much deeper.
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