I've never seen any dyno proof but that is what I have heard as well. Kinda like you gain some from the exhaust but loose on the timing. My first time at the track in august, I ran 14.3 stock, about 90 degrees. The next time was about 70 degrees and I had pulleys too and I ran 13.6 on streets.
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96 Crystal White Cobra Coupe
4:10 gears, off-road h-pipe, 2 chamber flowmasters, K&N, pulleys, FMS springs, polyurethane bushing, Steeda Caster/Camber plates
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