Black-series stiffer inserts for the F22, RF30, F32 rear subframe mounts.
Subframe mount inserts for the F22 2-series, F30 3-series, and F32 4-series are a great way of stiffening the rear suspension without having to completely remove the subframe and press out the original mounts. These inserts are like spacers, filling the voids in the stock rubber mount, and restricting excess deflection and movement. This makes the whole rear suspension stiffer but since the rubber mounts remain in place there is little or no sacrifice in ride quality, noise, or vibration. These will also help the stock rubber bushings last longer since deflection is limited.
Powerflex has designed these bushing inserts to be a direct fit to the factory subframe mounts. The subframe will need to be partially lowered to gain access to the top of the subframe mount. Once lowered the inserts simply slide into place and refit the subframe with the factory hardware and retaining plate. In most cases an alignment is not required.
The Black series urethane is stiffer than the standard Yellow spec sold for regular street use. The Black will further restrict subframe movement, especially in hard launches for drag racing, autocross, or other hard driving.
BMW Fitments:
2 Series
F22 / F23 (2014+) > 228i / 228ix
F22 / F23 (2014+) > 230i / 230ix
F22 / F23 (2014+) > M235i / M235ix
F22 / F23 (2014+) > M240i / M240ix
3 Series
F30 / F31 / F34 (2012+) > 320i / 320ix
F30 / F31 / F34 (2012+) > 328d / 328dx
F30 / F31 / F34 (2012+) > 328i / 328ix
F30 / F31 / F34 (2012+) > 330i / 330ix
F30 / F31 / F34 (2012+) > 335i / 335ix
F30 / F31 / F34 (2012+) > 340i / 340ix
4 Series
F32 / F33 / F36 (2014+) > 428i / 428ix
F32 / F33 / F36 (2014+) > 430i / 430ix
F32 / F33 / F36 (2014+) > 435i / 435ix
F32 / F33 / F36 (2014+) > 440i / 440ix
