EFI and Carby Cultus both sound different. Don't know if mufflers of both are same or not...
Sound is pretty much like stock muffler dholki in my case.
There are many qualities available in market i can't recall their name's now though. Muffler only is available from 400-1200/-RS and front pipe along with that small muffler from engine to mid of car is available for 1100-2200/-RS i guess..
Front FF muffler of my Khyber lasted Around 16 year's.
Cultus one got damaged after about 11 year's by getting hit from something on a village road.