Noise level, HUH? can't hear you. With the DC headsets is was bearable, that was in 1983. It sure would have been nice to have he DNC headsets. FYI; Pacific Coast Avionics has their $249 headsets on sale for $229. These are made by Lightspeed.
You could fly the Scooter (T211) with the canopy all the way back, but it was awfully noisy and windy. Also cut down on performance quite a bit. The bubble canopy made for a pretty hot ride when the sun was out, so I used to routinely fly it with the canopy cracked open about 2 or 3 inches. There was a spot right in there where the canopy would stay in place. It made for a lot cooler ride. It was a noisy little bird in any event as the exhaust dumped out of the side right below the leading edge, and real close to your ear! Haven't heard real well out of my left ear every since flying the scooters for about 500 hours over a five year period!