I was looking for a fishtail muffler for my 06 RK and i came across one made by Paughco. Does anyone have anything good or bad to tell me about Paughco mufflers. They seems to be rather economically priced but that doesn't make thembad. Also, am I correct to assume that as long as I only change mufflers that I don't need to do anything else like remap, etc.?