I have a 2011 Mustang GT 5.0 that I've used mostly for track days for the past year. I've lowered the car 1-1/2" front and rear using Ford Racing P springs. I also installed Whiteline upper and lower rear control arms among other mods. When I run car at track I just don't trust that rear of car won't jump out on me. I've been track driving since 1978 so MY rear end is pretty sensitive by this point. I find myself babying the car off the corners. Just recently I started thinking about why the car behaves this way. I went back to basics and realized Whiteline setup was a mistake. The rear lower control arm bracket is set up for too much anti squat. the lower arms angle upward quite a bit resulting in a large amount of anti squat. With this set up under acceleration the rear suspension is getting loads transferred immediately through the suspension links instead of more gradually through the springs and shocks. This may be good for drag racing but not for the track. I've ordered BMR rear lower control arm brackets with 3 location positions so I can level out the lower control arms and significantly reduce the anti squat. How much anti squat do you track guys run? The rule of thumb is 50%. I'm curious as to what the consensus is.