4340 forged steel construction for lightweight strength and durability

F10 BMW 520i and 528i (RWD and XDrive)

Engine oil cooler line

the 5150 AutoSport Pro-Xtreme Forged Pistons are built to handle the extreme demands of high-horsepower S52 engines

Lightweight H-beam design – reduces rotating mass for improved throttle response and efficiency

N63 Valve Guides 5467 4340 forged steel construction forOur HD bronze valve guides for the BMW N63 engine are engineered for high performance, high boost applications where OEM materials reach their limits. These replace the factory BMW valve guides in the cylinder head (intake and exhaust guide assemblies). Built to withstand extreme heat, increased valve spring pressures, and sustained high RPM operation, these guides deliver exceptional stability and durability under demanding conditions. Machined from