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I prefer to have some sort of muffler, so I have installed a Thrush glasspack 2 1/2" in and out. Nice and throaty, but not ugly and crackly like no muffler.
If I ever pull my muffler, this is probably the route I'll go.
After 10-11 years one of the devertors inside my FM 40s decided to turn loose and the high pitched vibration was driving me nuts!! Called my exhaust buddy and had him make me a custom 'roll steel' muffler 8" round X 26" long with dual in/dual out 2.5" pipes completely hollow inside. This was the first time he made a dual in/dual out and he really liked the sound. Sounds damn good to me and there's even less noise in the cab than with the FM 40s.