I have owned both CFR's and Rienhart slipons in the past and consider those the best sounding of all exhausts I've heard.
Nowadays I like listening to the radio more then my exhaust, so both my bikes have Supertrapp Fatshots w/closed endcaps and the appropriate number of discs for the best power my tune will produce.
Put on V&H Power duals and Kury. Crushers before it came home. Had a Fatbob before with Big Radius and BCT QQ baffles. I liked the Fatbob setup but wanted to keep the original look of the twin pipes on the Limited. Deep and mellow. Mike
CFR is the cream of the crop but are pricey and can be tough to find. I went with RC components RCX 4" slip ons. Great sound and a lot of choices for end caps.