I just ordered a set of Vance & Hines Quiet Series Double Barrels. Havent heard them yet but some of my previous posts on here have gotten incredible responses on how nice and mellow these pipes are with much more bark than the stock HD pipes. Check them out on V&H's website..they look cool.
I went with Rush slip-ons with 1.5" baffles. Very satisfied with them. Deep tone, will bark when you roll it on, without the want for ear plugs...I am over 40 and want to preserve what hearing I have left after the abuse they received during the 80's!
I installed the VH Big Radius 2-into-1 and they are awesome.....they have a really deep throaty sound without the cackle and backfire.....great power and it won't wake the neighbors....