well the gts are 4.6 2v rated at 260.. If were talking about the cobra I would go with you to win, but you asked gt. You didn't say whether the sti had mods, or if the guy could drive. So you need to factor in all of this. Just race him and let us know what happens lol...
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1999 Mustang GT 35th Aniversery
2007 Yamaha Raptor 700R