MMX Billet Subframe Inserts For BMW F2X & F3X Vehicles Decat Remove the stock paper filter

Remove the stock paper filter and install the K&N panel element into the original airbox seal

OE-grade damping for the E34 chassis with the dependable Bilstein B4 tune

front 40mm rear 35mm

Engine Protect System + to retain OEM-style safety functions

MMX Billet Subframe Inserts For BMW F2X & F3X Vehicles Decat Remove the stock paper filterThe MMX Billet Subframe Insert Kit is a precision engineered solution designed to improve handling and stability on F Series BMWs (F2X & F3X). By filling the voids in the OEM rubber rear subframe mounts, these billet aluminium inserts limit unwanted movement, helping to maintain correct suspension geometry and deliver sharper, more predictable dynamics. Under load, BMWs stock rubber subframe mounts flex, making the rear feel loose and vague,