SLR Speed - BMW Rear Floor Subframe to Shock Tower BraceThis rear floor to shock tower brace closely follows how BMW Motorsport reinforced the factory E46 GTR and touring car shells into the rear floor subframe location. This brace performs several functions: Rear floor reinforcement to combat stress fractures at subframe mount locations Rear shock tower reinforcement to allow coil over shock (aka true coilover) installations. Lateral reinforcement and structural replacement after notching the factory