I would not plug up the foot well with even a screen, no snow will get into and on the clutches. far too hot for that, If you noticed when you take the clutch cover off there is a small bit of foam on the bottom facing the left footwell, cut that section completely out. it will allow more evacuated belt dust and heat and yes it is easy to ride these machines and never let them cool down but if you do so you will go through belts. Same with t3 you could just ride it hard for 4 hours but if you do it wont cool down and your just pre wearing the belt life. The clutch cover in some of our test sleds went right to the floor so it works but the cvt cover does evacuate the heat super well it is just with that it going to the floor or now half that distance it holds more heat. and yes get all the felt and foam out for those who have not, it will not void your warranty and it is just for sound...shows you how quiet they have to be and how much loader they are with a can, and why we are losing riding areas...but that is another can of worms.
Do you recommend removing the foam inside the cvt cover completely? And what about the foam behind the secondary clutch blocking the air Box?