BMW E60 M5 Muffler Delete: After HD

This is an interior sound comparison of Muffler Delete (only stock mufflers taken out). All windows are rolled down (opened): 1. No drone 2. Cruising speed is relatively quite with all windows rolled-up 3. Great F1 sound noticeable above 5K RPM Worked performed by Hi-FLO Custom...Tremendous workmanship and inexpensive