I've always described the TORS exhaust system as sounding like a cross between a NASCAR stock car and a John Deere tractor.
My lovely Aussie Mad Dog exhaust setup emits a mellifluous, throaty growl that is both pleasing and progressively impressive as one adds throttle.
Carpenter's Brute exhaust has an exhaust note that for me is reminiscent of an F-16 performing a steady throttle roll-on upon take-off. If the throttle is hammered it emits both bark and bite.
The Jardine exhaust reminds me of the steady stocatto of a Ma Deuce 50 caliber machine gun.
Of course, these are simply my own subjective impressions.