4-pin design locks the crank hub to the crankshaft

and the G87 M2

Featuring an exclusive 58mm inducer GEN2 CEA® (Competition Engineered Aerodynamics) compressor wheel machined from a 2618-aluminum forging and a 62mm CEA® turbine wheel

Does NOT fit M54B25

Mahle Motorsport PowerPak Piston Set, BMW M54 B30 Compression Ratio:10.5:1 4-pin design locks the crankThe MAHLE Motorsport PowerPak kit is their high volume shelf stock program developed for high performance enthusiasts. PowerPak pistons are made from 4032 aluminum alloy to allow for tighter cylinder to wall clearances and improved temperature stability. PowerPak Features: Forged piston for performance applications Fully machined crown Grafal anti Friction coating on skirts reduces drag, scuffing, friction and cylinder bore wear; reduces piston noise.