I've been playing around with a z32 rear brake upgrade on my P11 for a while now, but shelved it due to the hand/park brake issue. Since then, I've found a company that do tow pot rear calipers that retain the hand function. They look almost identical in dimentions to the z32 calipers, so this project my kick off again in the spring after I've finished doing the VE swap...
Incidently, 280mm rear discs are standard on my GT...
Incidently, 280mm rear discs are standard on my GT...