The S63 V8 is a masterpiece of modern engineering, but transforming your X5M or X6M into an uncompromising powerhouse requires serious bottom-end fortification. Protect your engine block against extreme forced induction pressures with high-strength Forged Pistons and heavy-duty Forged Connecting Rods/Conrods. Lock your rotating assembly down with high-tensile Upgraded Engine Bolts (ARP) and reduce friction using race-specification Performance Bearings (Conrod & Mains). Secure the build with reinforced Engine Gaskets, and maximize your top-end breathing with Performance Camshafts and Valve Spring Upgrades.