There is a difference between domestic and HDI mufflers in 2014 SERK, as it seems to me. From other forums I can say that domestic mufflers have straight through baffle with a plug in the end, that can be easily cut with a hole saw.
Mine, being HDI, had very restrictive baffle (see pic), that sounded like... Cant really describe this. Sound was weak, muffled, almost nonexistent at idle (just the mechanical noise). Not pleased at all.
First step I have removed the catalyst. I got more db's but sound QUALITY did not improve at all.
I googled some images of CVO baffles and copied the design I liked best. Bought some 42 mm mild steel pipe, reused both ends off my stock baffle, couple welds, black exhaust paint, one hour's work and thats it.
Am really happy with the sound. It is deep, mellow, with a crisp bark when I twist the throttle. Not very loud at highway speed.