Hey if you're looking for street light to light racing, the stock turbo would be ample enough with your basic go fast mods such as cold air kit, injectors, fuel pump, chip, stuff like that. The stock turbo is good for spooling up quickly, and ive seen guys get into mid to low 13's with them. The track however is a different story, as they will tend to run out of steam with stock. But if its just light to light screwing around, you could prolly put the money you would have on a turbo to other things like exhaust, or downpipe. Just a thought!