The twin-turbocharged 3.0-litre S55 inline-six engine in the F80 M3 is a motorsport-derived masterpiece, but pushing past stage 2 power levels or installing large hybrid turbochargers requires a heavily reinforced internal architecture. Extreme cylinder pressures and high boost loads can expose bottom-end limits under heavy track use. Fortify your S55 block with heavy-duty Forged Pistons and ultra-strong Forged Connecting Rods/Conrods. Secure your rotating assembly with high-tensile Upgraded Engine Bolts (ARP) and drastically reduce internal friction using race-spec Performance Bearings (Conrod & Mains). Ensure a flawless, high-pressure seal across your cylinder head with heavy-duty upgraded Engine Gaskets.