It was done on both fresh new black top and old, with my 82 280zx turbo 116,000 original miles with ported exhaust manifold, 10lbs of boost,3.70 lsd diff, stock trans, and 215/60/15 tires. , one of the 4 turbo 280zx turbos I have. its only a 12.8 car right now but I have plans. Only time to build on it is the limiting factor right now. Header, T4 turbo, cam, custom Intake and fuel system next.