Pics show an MVVS 58 Pro mounted in a QQ Yak and an MVVS 45 mounted in an Xtreme Composite Edge, the 45 mounting is a propriatary mount available from MVVS the Yak mounting is one I made myself, these help spread the load over a larger area and isolates some of the vibration, no other mods to the firewall where carried out.

Mike