Not had a problem with the rear box on mine - just the end of the tailpipe, which now looks like a 'D' on it's side, except the flat part of the D, which is on the bottom, is kinked in/upwards towards the curved top part, if you see what I mean...
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly '11 MINI Countryman Cooper D All4 '90 LR 90 SW