BMW 6 Series E63/E64 M6 (2005 - 2011) Front Roll Bar/Subframe Strengthening Support Plate - PFF5-4203PLT The aluminium front subframe fitted to the E6* M5/M6 is prone to failure at the point where the roll bar bracket clamps to the subframe. Once this point starts to weaken and bend, it can lead to the subframe tab fracturing or the bush clamp cracking. PFF5-4203PLT is a high-grade zinc-coated steel plate to strengthen the subframe at this point. FEA testing has shown the addition of PFF5-4203PLT, to reduce stress in the subframe by 22.5%. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!