Originally Posted by flipm3
Many have said the same thing for the E46 M3 and running a full and true rear coilover. But it has been proven otherwise for quite some time, showing that theory is rather different than reality. I know of quite a bit of guys in the E46 M3 platform running true rear coilovers and simply using a small reinforcement plate on the rear shock mounts.
I wonder if the same would ever apply to the E9X M3...
A reinforcement plate is required to prevent an eventual tearing, cracking or weakening of the rear shock towers on the E46, E36 and E30 cars.
Sadly, I have seen a few of these failures in the past year and it is not a fun repair.