Thats what you are looking for....
Makes a hell of a difference plus it protects the nismo exhaust!!!
If your car has sports coilovers then this thing will be catching everywhere...and if it does for good then it rattles like mad....
I cant think of many tracks where you would benefit from NOS m8 tho... drag race and traffic lights yes... but tracks are usually twisty with short straights.... chassis reinforcements, brakes, suspension, LSD, tires, wheel alignment, ARBs, active body kit and you are sorted!!!
ie last weekend me and darren were at cadwell park on a cold wet and later damp/dry track ...and my 309 roadster was driving circles around M3s with 343bhp!!! (even a new evo tweaked to 400bhp, or thats what he said anyway, was struggling to get rid of me!)