Did you try smacking the carpet piece up? It takes some force for it to go in.
Bilstein B8 Euro-spec struts, Bilstein B8 shocks, eibach pro-kit springs, Remus exhaust, stage 3 intake manifold,Stage 2 AA tune, BMW Short shift kit. Silicon intake pipe. M3 control arms front, M3 rear. ECS trailing arm with whiteline bushings. Purple powerflex subframe bushings. Yellow power flex upper shock mounts. Solid mass flywheel OE weight.