51 47 490 Removing and installing/replacing underbody protection, front (engine) (M Roadster, M Coupe): Installation:

First tighten screws (1) (danger of damage).

Center underbody protection (3) and tighten screws (2).

Only replace:

Unfasten screws (1) and lift off air guide (2).

Fig 1: Removing Air Guide

Courtesy of BMW OF NORTH AMERICA, INC.