The TB on these bikes are loud and the heavy breather is like a megaphone going right to the intake valves.
From what I understand the "C" lifters (made in mexico) in the newer bikes are not that reliable and upgrading is desireable. My bike came with the "B" lifters and they are still good but I swapped them out and I put in the SE lifters (made in USA by Jims) in my bike and I haven't had any problems as of yet, I still have my "B" lifters as a back up.
A aftermarket cam will cause a bit more noise coming out of the TB depending on how steep the ramps are on the cam, steeper ramps on the cam will cause the valves to snap shut faster.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.