Powerflex Engine Mount Insert Kit PFF5-4021We are pleased to introduce PFF5 4020 and PFF5 4021 Engine Mount Insert Kits, intermediate alternatives to the BMW aluminium inserts and much stiffer full replacement engine mounts available on the aftermarket. Made in our Yellow 70A durometer material, they are designed to fit the voiding of the OE mounts snuggly to restrict engine movement with a minimal increase in NVH, perfect for those with tuned road cars. Their design and flexibility also mean