13 74 001 Removing and installing/replacing sound generator (M54)
WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
Loosen hose clamp.
Open quick-release coupling (1) on rear side.
Withdraw sound generator (2) from intake pipe and sound pipe (3) and remove.
Fig 1: Removing Sound Generator From Intake Pipe And Sound Pipe