Sorry man, you aren't going to get close to 500whp with the Stillen kit. 450 is a slightly more realistic number and that's high. I don't have this kit, but I would expect a pulley upgrade, 928 impeller upgrade, custom tuning, full exhaust, idk... will take some work. If 500 is your goal, I would look elsewhere.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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