Mahle MS Piston Set BMW S54 B32 E46 M3 3.2L 87.25mm Bore 91mm Stroke 139mm Rod 21mm Pin-13.1cc 11.6 CR Set of 6

The Mahle PowerPak Plus pistons were designed as a completely finished drop-in piston assembly. Other than filling the included performance piston ring set, everything is done for you. Mahle has over 80 plus years of piston manufacturing making pistons from OEM to formula 1 racing. Mahle uses only the best technology to make these pistons. Mahle pistons come standard with anti-friction skirt coating for reduced drag. Forged from 2618 aluminum alloy for high strength and reduced piston to wall clearance. Forced Pin Oiler is used for increased wrist pin lubrication. Pin bores are CNC precision-machined. 21mm High-Quality Steel Wrist Pins, Performance 1.2, 1.2, 2.8mm performance ring set, steel nitrided top ring, and Race Proven Round Wire Locks are included.

Compression Ratio with 33cc Heads 9.1:1.
***Replaces part number S54271445P29***