Powerflex USA - Powerflex Tuneable Hybrid Urethane Engine Mounts - E36, E46, Z3, E9X M3Why have only one engine mount? The Powerflex Tuneable "Hybrid" Urethane & Aluminum engine mounts for the E36, E46, and E90 E92 M3 are configurable to match your current car spec. It's "tuneable" to multiple performance settings Street Performance with a dual urethane core (65A and 80A bushings) Track Performance using stiffening pins inserted into the mount. The mount does not need to be removed to insert the pins, making this a tuneable mount from