I just finished installing the Rinehart 4" slip on's. All I got to say is WOW!!!! Now the 2009 Ultra Classic sounds like a Harley! The sound is deep, substantial and satisfying (but not too loud). The exhaust notes seems to be equal or at least very close between both sides. This was an issue I was wondering about with the 2009 Ultra's OEM header pipes because my old bike was louder on the right side with D&D pipes. I did not have the time to do a road test yet. I had to clean up the bike (got caught in the rain the other day) put it all together and call it a day. Any way I’ll fill in the missing info tomorrow. I’m curious about how well the exhaust will perform and how it will react during deceleration (popping and back firing).