[Steeveedee]

Originally Posted by Ironangel

Drone is a constant that can come at varying harmonics...The sheet metal harmonics and the exhaust tones can interact to cause "drone" at varying speeds. The tires can come into play as well if they happen to emit a tone that harmonizes with the sheet metal and/or exhaust tone. LockDoc gave the fix, install a J pipe on each exhaust pipe located across from eachother. If that don't work install a crossover pipe between the J pipes and you'll have a tone and pressure equalizer that may render the whole system dead quiet...Interrupt the constant and you'll kill the drone...Might check the rear end lube while your down there because them worn gears can emit a drone as well...

Indeed, it could well be rear gear noise, and I have heard ones that had a varying level of sound.