or the BMW M54B22 and M54B25 with a 145mm length

As you increase the power output of your engine beyond its factory specifications

Incredibly powerful yet relatively compact in size

V-band Clamp for Down Pipe

BMW S65 Stroker Kit | 5150 AutoSport | 4.7L Bore Size:93 mm Bore or the BMW M54B22 andBMW S65 Stroker Kit by 5150 AutoSport Bigger displacement, more torque and more power; Our 5150 AutoSport 4. 5 4. 6L 4. 7L BMW S65 Stroker Kit is specifically designed for BMW S65 Engines. Benefits of Stroking an Engine: Higher displacement offers greater power output and torque from increased cylinder volume and improved air fuel mixture combustion Longer crankshaft stroke increases connecting rod leverage for increased torque output at lower RPMs