i will attribute my crappy launching against myself this time...i wasnt sure what pressure i should have had them at so i was intially at 28psi, then 22psi then 18 but it was a cold 18, so it probably went back up during the burnout...i tried to get them nice and smokey and warm but it just never really happened, back end kept sliding off the track. i swear i never had a scarier moment in my life then when my back end got really loose that one run... :o people said i didnt, but it sure felt as if i got the rear end in the other lane. i dunno if i hit oil or what..