When I installed my Fentons I drove about 4 miles to the exhaust shop - no pipes or muffler. It wasn't really that loud unless I got over 1500 rpm which really wasn't necessary. But I did anyway
It pretty much sounds like two louda$$ Harleys driving next to eachother. Definatley no damage - 5k miles since at 17mpg ave. (mostly in-city) with a heavy foot.
P.S. I routed mine straight out the back to keep it quieter in the cab and to keep the tailgaiters at bay!
