The factory mount is constructed from a die-cast aluminum mount which houses a large soft rubber bush with a vulcanised cast strut. The rubber bush contains a viscous oil cavity to absorb shock. The 1-piece OEM rubber bush does not completely fill the pocket inside the mount casing, leaving it prone to break under severe driving conditions. The drawback of the OEM design for 'performance minded' drivers is that long term stresses from power enhanced engines tends to cause premature wear of the both the driver and passenger side engine mounts, which either leads to their viscous damper becoming very sloppy or the aluminum casing cracking completely.
VF-Engineering designed, tooled up, and manufactured a complete new replacement, containing specially designed molded high durometer polyurethane bushes. The mount is constructed from billet (ingot) aluminum and supplied with high tensile hardware. Billet is physically twice as strong as cast and this mount is designed for strength. VF recommends changing side mounts in pairs only. Fitting should take no more than 60 minutes usually.