The car is not made of glass. If you have a budget like "Sun" (cyber evo) I think they could and probably rebuild diffs all day. Wheel offsett and stagger are thier playthings. They most likeley are backed by a big diff company, cusco, tomei, quife [kwife]
I am going to hunt down that back issue of SCC now I'll post in a minute.

 

They use Cusco diffs.

BTW, we've run staggered rims on the autocross EVOs for a couple years with no problems (1/2" larger in front) . . .

EVOlutionary