Generally speaking, a good catback will give you gains of at least 15 wheel horse. It all depends on the particular goal of that catback, as some are more focused toward sound rather than performance.
A popular choice is the Fast Intentions because dyno charts are everywhere, and they often make the best gains, 99 times out of 100. 25+ wheel horsepower gain is pretty impressive, after all.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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