I like water heat. Tom Langdon at Stovebolt recommended it to me years ago when he was still working at gm. I still use water heat to this day.
Mufflers for the Fenton's, it depends on what you want sound wise. A lot of guys like the sort of loud rapping sound. And that is ok if that is what you want. I prefer something a lot mellower and frankly quieter. You might consider looking at the Walker Quietflow mufflers. They would remind you of the old corvair turbo mufflers from former days, lol. Mellow rumble, no drone, not particularly expensive.
