Reducing exhaust noise

I dont know about mabs but when the landscaping crew comes thru my hood nobody sleeps. Those weed whackers and blowers you can hear from 2 blocks away and its annoying as heck. Its a necessary thing though just one of lifes quirks.

That must be on level ground. I don't have much of that around here and up hills it's way too noisy. During the day it's alright but I ride at night too and up hills at night it could wake the dead.

I don't have a camera but this is the kit:

Motorized Bicycles Detail Page

There's plenty of room on the exhaust side, not too much inside the plastic engine cover though.

Hmm... yeah, rack mounts - cool, but limited exhaust options... I dunno, mebbe someone with one has found somethin'? *shrug* The "cans" I've seen at the hardware stores were obv stock replacements for lawnmowers etc. Perhaps one of those would have better silencing - but it'd take modifying the manifold and I dunno which/any would actually be less noisy.

I don't see any realistic way to get any length either... stack exhaust?

There isn't an exhaust manifold. The muffler bolts to the cylinder.