RK Autowerks S63 Stage 2 Turbo Upgrade X3 Turner Motorsport’s Reinforced Billet Differential

Turner Motorsport’s Reinforced Billet Differential Cover addresses these shortcomings with a robust design that can withstand aggressive driving and track use

Designed for racing applications (not street legal)

These precision-engineered camshafts improve power delivery and ensure durability under demanding conditions

Since the heat exchanger sits front and center in the M3's cooling stack

Full stainless steel bolt kit

RK Autowerks S63 Stage 2 Turbo Upgrade X3 Turner Motorsport’s Reinforced Billet DifferentialService requires customer cores. The RK Autowerks S63 Stage 2 Turbo Upgrade by RK Autowerks is engineered for enthusiasts seeking substantial power gains without sacrificing the drivability or reliability of the factory turbo system. This upgrade preserves stock style spool characteristics and maintains full launch control functionality, making it ideal for street and track performance. To accommodate larger internal components, OEM turbo housings are