I am running a d15 w/ full exhaust intake and a zex 55 shot I am going on my third bottle no problems with the engine however if I launch hard at al I spin 1st and 2nd I can not get any traction at all Iam on yoko paradas (205/40/17) on the street. From a roll I am ok but I ran last night and could not get a decent launch from a stand still to save my life. should I launch first w/o nitrous at all then shift second and hit the switch. rolling slow in first then flooring it I am ok though... what do you think???? I am going down the track next week ....what do you think I "could" run high 15's???