PFF5-4203-29 fits E63 M6 with Comp Package and E64 M6

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and are engineered to flex and return to shape as the engine heats and cools—maintaining consistent clamping pressure on the head gasket throughout every heat cycle

making it the ideal choice for tuned and high-horsepower applications

2005 - 2010     BMW E63/E64     M6

8HP70 8HP75 8HP76 Billet Main Shaft Simpson PFF5-4203-29 fits E63 M6 withBillet Main Shaft for the ZF 8HP70, 8HP75, and 8HP76 transmissions is engineered for high performance and extreme duty applications. Precision machined from premium 300M alloy steel, this shaft is heat treated and hardened to deliver exceptional strength, durability, and resistance to torsional fatigue. Designed as an upgraded replacement for the factory component, this billet main shaft features modified geometry to handle increased power levels and