BMW Motorsport 3.85 Ring and Pinion Gear Set – E46 M3 / E60 M5 / E63 M6 C4352-070 They will NOT fit M54B25

They will NOT fit M54B25 engines

and/or boost controllers

S38 Inline-6

Built-in speed sensor provision (sensor sold separately)

BMW Motorsport 3.85 Ring and Pinion Gear Set – E46 M3 / E60 M5 / E63 M6 C4352-070 They will NOT fit M54B25Looking for a proven way to boost acceleration without adding stress to your BMWs engine or drivetrain? The BMW Motorsport 3. 85 Ring and Pinion Gear Set is one of the most effective performance upgrades available for the E46 M3, E60 M5, and E63 E64 M6. By switching to a shorter final drive ratio, like 3. 85: 1, you increase rear wheel torque by approximately 6%, delivering noticeably quicker acceleration and improved throttle response in every gear.