Mine was given to me last year. (Not suppose to work unless it was given to you as a gift, not given to yourself). I placed it along the right frame rail, and I don"t recall it dragging, but with the pipes as loud as they are, and the ear plugs, I can't hear a thing anyways.
I wondered if some folks hear have them on their bikes, just another way for riders to think and give to each other, pretty cool in my mind. Door slammers just don't share that comradery.