Your salesman is correct: according to the Ordering Guide, the Enhanced Premium Sound 752 must be ordered with 609 Navigation System or ZTP Technology Package (EDC, M Drive, Comfort access, Nav).
2008 E92 M3 Coupe 6MT
| 2009 E70 X5 xDrive 48i M Sport
| 1967 Corvette Coupe
2001 E46 M3 - Sold | 1997 E36 M3 - Sold | BMW CCA member