I put a set of 2004 RK mufflers on my 2006 RSMV. I purchased a set of mounting brackets from one of the forum members. After installing them on the bike, I took a three eights inch steel rod, thirty six inches long, that I had purchased from Home Depot, sharpened one end, and then I slid it up each tail pipe and pounded it through each baffle in the RK muffler. The bike was running when I did this so I could hear the difference each time I punched through a baffle. I kept punching holes until I got the sound I was looking for. Sounds real sweet especially when I pull up beside another Harley. By the way, I purchased My set of RK mufflers, which were new, from on E bay for 36 dollars. Hope this helps you.
Jerry