I personally run CFRs on my Street Glide however, we have had a LOT of folks purchase the
4.5" POWR-FLO Slip-ons recently all providing awesome feedback. Most who have gone this route were looking for a deep, throaty slip-on with a sound similar to the CFRs but without the wait and everything we have heard from these customers, the POWR-FLOs sound just as good if not deeper....especially on an 'open' header. That being said, I feel you'd be very happy with this selection.
Hopefully this helps but certainly let me know if there are any questions....
Lindsey :0)