Have looked through this section about exhaust drone but did not see where anyone has tried putting weights on the exhaust pipe before and after the muffler. Read this in ehow: Clamp weights to the exhaust pipes. Exhaust drone can be damped by increasing the density of the material through which the vibration must travel
. Clamp solid steel or lead to the exhaust pipe both before and after the muffler. Use ring clamps to secure the weight to the exhaust pipes. If this would work sure would be a cheap fix.
Read more: http://www.ehow.com/how_8080950_fix-...#ixzz2ocsN1u3b