i got 280mm frnt cossie setup on 15's more than adequte, and yes i am using this car soley for 1/4 mile and track days, 300 is the most i wld want as thats pushing the fwd chassis! if i go zvh route i guess abigger exhaust turbine wldnt cause so much of an issue with lag cuz of the increase in capacity which wld make more exhaust to spin it up!