I seriously just fixed this problem with my brothers car.... His 12 bolt broke two Ta'a before we bought a Umi T/a and Hal 12 ways on all four corners. Take the car to a speed shop and have them install your adj. Ta and set the correct pinion angle. I would not be scared to leave the line @ 4000 rpms through his M6 now. If you buy anything buy Hal 12 way rear shocks. They are unbelivable at the track.
Steve

 

Thanks guys.

I took another look at my LCA's an they run pretty much parallel to my SFC's on each side, so I ordered some relo brackets to have better geometry. With the new shocks, BMR trak pak and anti-squat brackets I should be all set.

 

i want to get the bmr trak pak too, but i think im going with a madman torque arm instead.