I am not having any trouble keeping the Z straight- the tire spin is still there but only a little bit ALSO I'm a little concerned about my axles snapping being that they are N/A axles and besides: I want things to be fair between me and my friend (rival)-see he has a Pontiac GTO with about 430rwhp (13.2 @111) and I would like everything to be apples to apples -when he gets drags I'll get drags, so far I have achieved a best of 13.022@109.89 and I feel I have room to improve even on these street tires, I feel I may be able to knock another 2 tenths off my 60' it definitely takes more skill to get a low 60' with street tires. I'll let you know what I run this Friday hopefully