Call PTC. I can't remember their number. I can get it for you since I'm calling them this week to order mine stall. I'm running 8.3s and 1.97 60ft times. I'm spinning drag radials. They told me I would cut .4 off my 8th
Cool man whats your combo and what drag radials are you running. MT Streets are really good I got friends with ls1 cars and stock suspension running 7.50 or lower with them