i've seen a couple of youtube videos on "supercharging" you snowblower. Using pieces of thick rubber, attaching them to the impeller so that it shoots out the snow with more force. I think i might give it a try.

it shouldn't. When you first install, the rubber is touching the outer walls, but after running for a little bit, the rubber would be worn in to just touch. All you are doing is closing up the gap between the impeller and the walls.