5150 AutoSport CP Carrillo Pro-Xtreme Forged Piston Set For BMW S58 Engine5150 AutoSport's CP Carrillo Forged Pistons for the BMW S58 engine found in the BMW G80 G82 G83, X3M, F97 X3M, F98 X4M and G87 M2. The S58 is an aluminium block with a spray on iron coating on the cylinder walls. This allows the engine to have the strength and durability of a cast iron block, while still retaining the lightweight and heat dissipation benefits of an aluminium block. These pistons are a factory replacement; no modification will be