If you have a blown GT your car weighs about 3400 lbs. So I'd have you beat by roughly 300 lbs... but that is worth about 30 horsepower. I'm sure your car is making at least 360-380 fwhp... if you have an intercooler then more. So it'd be a good race. The 405 hp versions aren't noticeably faster than the 385 versions because the power comes at very high rpms