I finally got around to doing this today. I've got to say, I'm pleasantly surprised. I expected it to just sound like an exhaust leak, but it really does sound great. I did 3 washers on each bolt. I can't believe anyone would just do 1. I couldn't even tell a difference and 3 isn't even loud. I might even add another just to see. It was most certainly worth the couple bucks and 10 mins of my time. I quite like it.