On a stock car ('99+ GT at least, not sure on other stangs) the tune should be pretty dead on so you wouldn't see much gain from that based on a magazine article I read where they tuned a stock car and got nothing extra. However, a chip or programmer will allow you to bump the timing for a little extra power (this will necessitate running higher octane gas though).
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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