A forged piston set for the BMW N55B30 single-turbo inline-6 engine, built to an 84mm bore with a 3/8 ring pack and supplied together with connecting rod bolts. Comparable N55 forged-internals kits use 4032 forged-aluminum pistons with a 10.2:1 compression ratio, a 22mm pin, and ARP-grade bolts, intended for builders assembling a stronger, boost-capable short block than the factory N55 piston.

Fitment: BMW 1, 2, 3, 4 and 5 Series models (chassis F20, F22, F30, F32, F10) fitted with the N55B30 turbocharged engine.