(See www.billanddot.com for additional pictures.) This is a comparison of Yoshimura's new exhaust system for Suzuki's Burgman 650 scooter and the OEM system. Note that the camera used to record this (from a distance of about 7 feet) has automatic volume control to prevent distortion; I don't think this came into play, but I'm not positive. Both scoots were run at idle, then 3000, 4000, and 5000rpm.
Burgman, 650, Yoshimura, Exhaust