the 60' time of 1.72 ive done with bfg t/a 265-50-15s with about 19 lbs of air and approx 3/32 tread left in the middle. Gene Westbrook has done 1.5? on slicks with a 20lb transbrake launch at Piedmomt dragway and one of the members here ---Matt has the video link some where.I think its buicksofburlington or something like that.However you can achieve that with out gnx suspension though.It damn near makes poor street tires act like drag radials .Under boost it pre-loads the suspension by lifting the car thus pushing the rear end down and planting the tires.