i have the v&h slip ons on my 09 ultra and i love them.
They have a nice mellow sound till you crack the throttle.
i cant say if they are louder than rineharts tho .... i just don't want to switch bikes with my bud to see!!
I had the twin slashes on my 2011 Road Glide and they were nice low and mellow. Not a lot of sound in 5th or 6th gear though. These were just the slip ons though. I'm running with Rineharts now and they are definitely louder. I just installed the Power duals header and Heavy Breather. I expect it to give me a deeper sound. PC-V issues now so I have not tested them yet.
I've got the twin slashes on my SG with a 103, stage 1. Very happy with them and have had a lot of riders ask about them when they heard them.
A little tamer than most reinharts I've heard, just below "headache" level for me on long rides. I like the low rumble in 6th gear. Took them about 5,000 miles to burn in.
I had v&h twin slash 's on my 2006 SG, then transfer them over to my 2012 SG. I'm very happy with them, bike sounds good and I can still hear the stock speakers.
New 2012 Ultra, Twin-slash slipsons sounded nice but mellow. Then cut out CATs and put in an SE255 cam. Much louder, nice rumble, but can still listen to radio. Sound GREAT!