Knew about that one. Nismo has them on the Z-tune, and probably others. It doesn't seem logical to control suspension deflection there and then still have rubber bushings. I guess they know best, though. They'd probably also be little use on a S-chassis. That GT-R weighs 800+ pounds more than one of our cars. That's a lot of extra force/weight that we wouldn't have to deal with.

Did you catch the other intersting thing in that pic? 4-pot rear brembos!