Gotta give a +1 to the R-77. Its a little louder then stock at low rpms, but barely noticble. Comeing into the neighborhood I dare say you wouldn't notice me unless I dropped a gear and tacked it up to 3grand or so....I am too happy with mine, enough sound to be noticed a little but not enough to be annoying. Plus the weight savings is crazy. I just carted my old pipes to my building out back after about 3 months in the garage and was reminded again on how heavy the stock pipes are. Got a sound bit on you tube also.....