You need a mulching kit. Basically it covers the chute. I've used a few home made things, such as screen secured to the outside of the deck. It was just temporary, of course, but it worked for what little I needed.
But then I realized that just mulching and letting them lay, was easier and better for the grass. Those leaves your getting rid of are this winters and next springs fertilizer.
But basically, all you need is something to cover the chute.