This center cap originally fits: JR3 (15-16")

Can be used with WG45 Oulet Weld Flange (TS-0504-3002) with a suitable WG45 V-Band Clamp (TS-0504-3005)to form a 1

Driveshaft has to be from BMW E90 or E90 M3 or an aftermarket one that fits E90

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

JR Wheels JR11 20x8,5 ET35 5x112 Hyper Silver TPMS This center cap originally fits:PCD: 5x112 ET: 35