It is an insert that will remove the vertical movement of the subframe mount and stiffen up the rear end.
You need to drop the subframe mount plate to install it.
Email me.
'85 Euro 635csi Race Turbo, megasquirt, Group A
'92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
'02 Subaru WRX Wagon with STI springs, bigger sway bars