You act like lag is so bad.... Depending on what kind of driving/racing he does it may or may not be bad. If he plans on drag racing the car he will have alot better of a mph and more hp for all top end racing and would work very well. Now if he plans on road racing or auto x then those turbo's are way to big and he should be looking at the 500's- 530's. So with this said depending on how he races or drives his car the turbo choice will reflect on that.