The POWERFLEX REAR SUBFRAME FRONT BUSH PURPLE is a polyurethane insert, by Powerflex for BMW F2X & F3X. These are a great addition to any BMW build and an excellent low-cost improvement.
This is a replacement part that in our Road Series application is 60% stiffer than the original rubber bush to withstand increased loading seen by this position on the car. For a caster offset version please use PFF5-1901G.