Yep, that's what they do. Cut down a bit of noise too.
Hey Rich Steinel :waving:So now you have learned something new. :clapper: Yep they block about 80% of the cold air, :crying:and they also stopa lot of the crap that comes up through the tunnels :whip: onto your nice clean dials,and they also reduce a lot of theroad noise. :crying:They cost about $20 but you can make your own from the tips shown. :weightlifter:
Maybe tunnels haven't been around for 35 years? :cheeky1: