The GXP design chains had hardened pins but their still puny little bicycle chain looking pieces. The only way to go for a car that is modified or even stock and driven hard is a single chain conversion. The sprockets used for the single chain conversion are just 4t60 pieces with the thrust surface on the driven sprocket machined down and the holes for the reluctor drilled into the drive sprocket. I made my own out of core parts for free + the $40 for a brand new 15/16ths chain