Hi Prof,
Too many questions... I swapped the original for an EMGO inverse cone silencer.
The original weighed 5.680 kg, the EMGO 1.280 kg - divide by 454 for lbs. I can't imagine they come much lighter than the EMGO.
The computer seems OK with the EMGO, and there's no backfiring.
I bought it because the lid is screwed on, easy for repacking, and also because it costs 60$
I redid the insulation with a thick pack of "Moose" - it is still pretty loud though.
I'm not sure about the 'power boost'. I feel the bike runs pretty sweet at 70 mph in 6th or 7th - I mean top gear
.
The bike is so hugely underpowered that I tried to find any extra tiny little disabled horse I could, to more or less keep up with traffic (Ok, ok, I exagerate
).
I wouldn't call it "power boost", more like : "the horses may be a bit less anemic"
- but I can't be positive.
I suggest you mount the open exhaust, and if you can't live with the noise, either put in a plug, or switch back to the original.
As for the law, if you plan to ride in Germany or switzerland or New Hampshire, that might be an issue, otherwise, I don't know