BMW E81 / E82 / E87 / E88 1 Series & E90 / E91 / E92 / E93 3 Series Billet Aluminium Rear Differential Mount Insert Kit 2005 - 2013 (Excludes 1M / M3)

Eliminate rear differential movement and tighten up power delivery on your BMW E8X / E9X chassis with this premium billet aluminium rear differential mount insert kit, precision CNC-machined from 6061 billet aluminium for permanent durability and dramatically improved drivetrain response. Factory rubber differential bushings on the E8X / E9X chassis are notorious for deforming under load — particularly when applying or releasing throttle in spirited driving — resulting in vague feedback from the rear axle, clunky shifts, and unstable handling characteristics that frustrate enthusiasts. Commercially available polyurethane and solid differential bushings address the deformation issue but introduce significant NVH penalties and complicated installation procedures. This insert kit takes a smarter approach — precision-fit aluminium inserts fill the voids in the factory differential bracket, suppressing differential displacement and optimizing drivetrain response without the harsh NVH increase of full bushing replacement. The result is sharper throttle response, smoother shifts, and more consistent rear-end behavior with minimal impact on daily driveability.

Features:

• Sturdy and durable construction – 6061 billet aluminium material delivers exceptional strength while keeping weight low

• CNC machined precision – ensures high dimensional accuracy for a perfect fit to factory differential mounting bracket geometry

• Anodized surface finish – delivers rust-proof and anti-corrosion protection for sustained underbody and weather exposure

• Precision reinforcement design – factory-positioned inserts fill the voids in the differential bracket perfectly, suppressing rubber compliance without replacing the entire bushing

• Dynamic performance enhancement – suppresses differential displacement under load, optimizes shift smoothness, and maintains linear throttle response

• Low NVH improvement design – delivers performance benefits with minimal noise, vibration, and harshness increase compared to full polyurethane or solid bushing alternatives

• Simpler installation than full bushing replacement – avoids the complicated extraction and pressing procedures required for complete differential bushing replacement

Specifications:

• Condition: 100% Brand New

• Type: Rear Differential Mount Insert Kit