This is very common and worryingly hard to spot without removing the subframe.
M3 boot floor cracking.
Welding in reinforcement plates grinding flush.
I found the previous owners profile calibra and found the boot floor had been replaced by bmw in 2013.
Drill stop and weld any and all cracks around the mounting points.
We offer this service from 1500 including vat depending on the severity of the cracks.
See these pictures for the cracks that can form.
Thanks jonny p s has anyone heard of this happening before.
Removal of standard underseal seam sealers to identify cracks areas of concern.
Rebuild check set geometry.
E46 boot floor cracks.
Although if the car in question is an m3 in good condition the value of the car would make it worth doing.
Having a look under the car today i ve noticed a crack in the new floor i don t suppose theres a warranty on the warranty repair is there.
At ti motorsport we remove the interior from the car.