Another option you might consider is Two Brothers. I use it on my 04 600RR and it gets the job done. Its not as loud as D&D but its still rather loud overall. It has a low rumble tone when in the lower RPM, but will still scream near the top. I have had several people in vehicles in yards or cars at intersections turn towards me upon hearing me vs seeing me. Really, it comes down to personal pref, but do your research and figure out what YOU! want. The Link for Two Brothers Exhaust Flange-On for the 929 RR: http://www.twobros.com/cgi-bin/shopper?search=action&sku=005-9404&searchstart=0&template=Templates/TBRSearchResult-Simple-Hon-CBR929RR-SO.html A link to Sportrider's site for Exhaust Sound Clips, though I figure it might be sticked around here somewhere. http://www.sportrider.com/tech/146_0410_pipe_clips/ If at all possible, try to find people with the type of exhausts you are looking for and check out the sound in person. This will give you a hands on experience of what you will get, vs taking on the sound from your speakers on a recording.