While the S58 block provides a highly robust foundation, transforming your X3M or X4M into a hypercar-baiting machine requires serious bottom-end reinforcement. Safeguard your engine against massive forced induction pressures with high-strength Forged Pistons and heavy-duty Forged Connecting Rods/Conrods. Lock the rotating assembly down firmly using high-tensile Upgraded Engine Bolts (ARP) and reduce internal friction with race-spec Performance Bearings (Conrod & Mains). Secure your ultimate build with reinforced Engine Gaskets, and maximize your top-end breathing capability with Performance Camshafts and Valve Spring Upgrades.