As much as I like the loud grunt of any dirt bike, atv, or buggy; stealth is always a great thing.
Pros: Riding around the neighborhood at night, close to or on private property
, or not to disturb nature. Maybe even reduce emissions
Cons: Large muffler, loss of space ( maybe in cargo area), funny looking, as stated maybe loss of power.
I can't seem to come up with that many cons.
I say get some motivation and make this thing happen. Just to see what happens. Maybe use a smaller muffler from say a GEO tracker or metro ( I think those are 3 cylinders).