I had a set of the Bobvic modified stock mufflers on my RK. I didn't do any other mods till recently and the bike ran fine. They have a nice throaty idle and have an aggressive rap to them when you get on it. A little louder than S/E pipes , but notas loud as a Rhinehart. Perfect if you have a radio you want to listen to, but still have that HD sound. Still got 'em. PM me if you're interested. Bobvic sells on e-bay if you want more info.

 

I ran rush 2" for awhile by themselves and it ran fine. But eventually you will want to finnish with the pro-tuner and A/C

 

What about the modified stock exhausts on ebay? I think the ones that I saw were called B&E and then there is another one called Max Performance. They claim that there is no additional mods necessary, and they are by far the least expensive if you're just looking for some extra sound.
Has anyone had experience with these?