[Matticus91]

Originally Posted by Ginger_Extract

At this point, I would have just done an M3 rear end conversion and called it a day. The factory M-variable diff has proven itself to be capable of very fast lap times.

If that's too much to handle in one swing, just buy an MFactory clutch-type diff. My MFactory unit has been reliable, and I wouldn't hesitate to buy another of their products.

Solid advice, thank you!