hi! im going to install a saleen sc on my 05 gt, its manual w a few mods, including cams, it has the stock 355 gears, but how is the drive w the 373 gears and the sc? does not spin too much the wheels? also i have 20 inch wheels, 8.5 front, and 10 on the back. any idea how much affect this size in the cuarter mile? i think they affect me almost 1 sec!!
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