Good question Jim, I don't remember seeing a follow up post after seeing the pictures. Was that Damian's rig??
Logically in a residential area I think it would appear to be quieter by exhausting over our heads compared to dumping it under the truck. In a real congested area it still going to echo..
Hope they come with a homing beacon, don't want to lose $65 ear plugs.
Are they comfy?
How about conversational tones, can you hear your tech screaming at you to turn off the truck cause there is a cat stuck in the 2.5" hose?