PFR5-520BLK - BMW E39 Sedan Rear Subframe Front Mount Bushing
BMW E39 Sedan Rear Subframe Front Mount Bushing
Engineered as a direct replacement for the factory rubber unit and includes high-tensile, corrosion-resistant stainless steel inner sleeves and specialized assembly lubricant.
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
Previous Revisions
PFR5-520BX2
Cross Reference
PFR5-520
33311091422
Product Q&A
Lifetime Replacement
This product is not eligible for Lifetime Replacement
Fits These Cars
MAKE
MODEL
SUBMODEL
ENGINE
Special Fitment Notes
BMW
E39
525i
M54 2.5L
For Sedan Models Only
BMW
E39
528i
M52 2.8L
For Sedan Models Only
BMW
E39
530i
M54 3.0L
For Sedan Models Only
BMW
E39
540i
M62 4.4L
For Sedan Models Only
*The above product applications have been written by Turner Motorsport. All
warranties, product application, fitment, and performance are the responsibility of Turner Motorsport.
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