F32, F33, F36 4 Series xDrive 2013>. Powerflex Universal Exhaust Mount. Tighten up your car's suspension performance by fitting Powerflex Bushes. Powerflex Performance Bushes. Buying car parts can be tricky as there are often model variations and it is important to check all information such as model, model variations, manufacture dates, sizes and OEM part numbers where provided.