currently running Rinehart 3.5" slip on's with stock headers on a mild 95" built ultra, the sound is great for a little while, but after an hour or so it starts to get to me, any suggestions on quieter slip on's with out giving up too much performance?

 

supertrapps (less noise & MORE power than rienharts)

 

+1 on Supertrapp slip ons. Excellent performance, tunable power band and great sound. Has a mellow, deep hot rod sound. Had them on my Road King w stock header pipes until I went to the Supertrapp 2:1.