I answered your question in the first post after your question?

 

So far the M3 diff is still alive. Not sure for how long. M3 Shafts are stock also. This car does not have a drag radial on it but a road race tire which doesn't really get full traction in first gear anyway. It is a 315mm tire though. When it breaks we'll build a custom 8.8 setup for him!

 

Well the stock diff didn't last very long. We fixed the problem with a completely custom fabricated 8.8 IRS with 1000hp axles. NASCAR style sway bar in the rear also so it's completely adjustable and can change rates.

 

thats sick.