BMW E39 Sedan Rear Subframe Front Mount Bushing

Product Details

 the BMW E39 Sedan’s multi-link aluminum rear suspension is highly capable, but its performance is fundamentally limited by the factory rear subframe bushings. The stock rubber mounts are heavily voided to filter out road noise for luxury street driving. Under racetrack loads—extreme lateral cornering g-forces, hard braking, and high-torque acceleration—these rubber bushings deflect massively. This shifting of the entire rear subframe assembly causes dynamic toe and camber changes mid-corner, leading to unpredictable handling, snap oversteer, and severe wheel hop off the line.

The Powerflex Black Series is an ultra-high-performance track and motorsport solution designed to completely anchor the front mounting points of the rear subframe to the chassis. By utilizing Powerflex's hardest 95 Shore A polyurethane compound, this upgrade reduces subframe deflection to near-zero, ensuring the suspension geometry remains perfectly stable under maximum competitive stress.

Performance Characteristics

• 95 Shore A Motorsport Compound: Formulated specifically for race, rally, and circuit applications. This material is 25% stiffer than standard performance polyurethane and offers 80% more resistance to load deformation than factory rubber.

• Locked-In Geometry: By eliminating independent subframe movement, dynamic track alignment is perfectly maintained. Driver inputs are translated immediately to the tarmac, drastically sharpening turn-in precision and rear-end predictability.

• Advanced Material Engineering: Unlike solid metal mounts that can induce catastrophic chassis stress fractures around the subframe mounting ears, the Black Series absorbs high-frequency impact energy while maintaining absolute structural rigidity under load.

• Chemical & Thermal Resilience: Engineered to withstand the extreme environmental demands of endurance racing. Resistant to heat cycles, fuel, oil, and track debris that rapidly degrade factory rubber.

Prop 65 Warning

Product Q&A

Lifetime Replacement

Fits These Cars