Situations like that make me a bit concerned, being too loud to make someone sell it is a big move. Maybe some people are just sensitive to that sound and can't handle it as well as others.I talked to a guy on eBay that was selling his real nice Camo Viking, and asked why he was selling it, he said it was to LOUD. He even had a Kolphin stealth exhaust on it, he said it made a difference at idle, but when driving around, it did nothing, it was still loud, so like you said, its gonna take more than just a stealth exhaust.
From what I'm gathering, this would do more to quiet them down than anything. Gotta find a good way to insulate the cab from the engine/drive train. My friend had an old Ford diesel, with the 7.3 in it...and it was LOUD standing outside...but not near as bad inside. If they can quiet the cab of a truck with that in it...we should be able to do something with the Viking!Would adding sound insulation around the engine and transmission help? They have those mats that stick onto the frame that can isolate noise. Useless or useful? it probably adds some weight though.
Spent quite a bit of time messing with this stuff this weekend. My conclusion...If you want to quiet the cab down, here are my suggestions.Re Dynamat 'Extreme', the shiny stuff is aluminum. No rust worries. I would say it's water resistant, not wateroof. Heavy.
You may want to look at their Dynaliner. Fully waterproof. Lighter.
I've used both in cars I've owned/built.
IMHO, I don't think either will reduce the engine noise much. It's a single cylinder engine in an open cockpit.
Hope I'm wrong.