Front Lower Rear Diff Mount 'Black Series' EVO 7, 8, 9. z32 The fresh air valve allows

The fresh air valve allows for incoming charged fresh air from the turbo to be diverted safely into the exhaust manifold pre-turbine wheel with the throttle at low opening angles to allow for safer spooling of the turbocharger without the potentially damaging throttle based late combustion event style anti-lag that can induce high engine stresses and break connecting rods

PFR5-324 fits later M3 Evo models where the bush fits into a separate mounting bracket

Ideal for thoselooking for on-car camber tuneability

The standard valves are often not up to eliminating damaging compressor surge

Front Lower Rear Diff Mount 'Black Series' EVO 7, 8, 9. z32 The fresh air valve allowsPOWERFLEX FRONT LOWER DIFF MOUNT PFF44 107BLK Please check size before ordering, this is 62mm Diameter. For 70. 5mm Diameter use PFF44 108BLK. These mounts are for fast road competition. These are harder and may cause a slight increase in engine vibration and noise. For road use, use PFF44 107R. Bush Size: 62mm Diameter Diagram Position: 6 Number of Bushes Supplied: 1 Range: BLACK Series (Motorsport Use)