The 2.0-litre turbocharged B48A20E engine in the F40 128ti is a strong 4-cylinder unit, but extracting extreme horsepower figures or fitting larger aftermarket turbochargers requires a heavily reinforced bottom end. High cylinder pressures generated by aggressive tuning can quickly exceed stock internal limits. Fortify your B48 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 perfect seal across your engine block and cylinder head with upgraded Engine Gaskets.