KA or KAT for drifting any RB SR20DET or VG30DETTfor drag or autocross, I know of a VG doing 6.6 in the quarter. I have both SR and KA and prefer the SR because I dont have to worry about parts and I like to do crazy things to it. I would reccomend the KA simply because I have put 276,000 miles on one, they never die.