Quote:
Originally posted by twitchy
I kept the stock muffler for backpressure, I was told by the mechanic who did it that larger bore pipe tends to increase the power at higher RPMs, and if I didnt have the stock muffler for some restriction it would have likely shifted the power curve up higher than I could have used it.
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The mechanic doesn't know what he's talking about.
Proper exhaust design isn't about "backpressure" except trying to eliminate it entirely, while maintaining flow velocity. This means a properly sized pipe (which it sounds like you had) but as little restriction as possible (bad idea keeping the stock muffler). A more effective cheap upgrade would be to leave the stock tubing and change the muffler. You'd see small gains all across the curve.