a4 LT1 z28 =$5,000

gears, long tubes, drag radials, cold air, stall, nitrous and ignition setup for the gas = low 12 second car for $7500 and will still be very streetable. gas mileage wont be bad at all, and it'll walk the hell out of 99% of the cars on the road along with sounding nice.

LT1... just do it