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The B58 engine inside the M340i is world-renowned for its closed-deck strength, but pushing for extreme horsepower figures via big-turbo conversions demands reinforced internal architecture. High cylinder pressures from custom mapping will eventually test the limits of factory rods and pistons. Fortify your inline-six block using high-strength Forged Pistons and heavy-duty Forged Connecting Rods/Conrods. Secure the rotating assembly with high-tensile Upgraded Engine Bolts (ARP) and reduce friction using race-specification Performance Bearings (Conrod & Mains). Ensure a perfect seal under massive boost using heavy-duty Engine Gaskets, and maximize your cylinder head volumetric efficiency with Performance Camshafts and Valve Spring Upgrades.