Precision-forged M54B30 piston crafted from high-grade aluminum alloy for exceptional durability and heat resistance. Engineered to exact 84.5mm specifications with reinforced skirt design for BMW E39 530i, E36 Z3, and E53 X5 3.0i engines. Features advanced thermal coating to reduce friction and improve combustion efficiency. CNC-machined for perfect bore alignment and optimized compression ratio. Direct OEM replacement with superior forged construction versus stock cast pistons. Ideal for performance builds, engine rebuilds, or high-mileage vehicle maintenance. Ships in protective anti-corrosion packaging with full gasket compatibility. Bulk pricing available for workshops and resellers.