Poor design or not, I've been riding 40 years and never had ice buildup in the tunnel like I do on the G4.I refuse to believe that snow and ice building up inside a tunnel should cause track failure. The tracks HAVE to be able to last in this environment. If a track is failing it's either not designed right or it's using defective or inferior materials. Sleds have been using tunnel mounted heat exchangers for many years. This is nothing new. The widespread use of 1.5" lugs IS relatively new. To call the g4 defective because of ice building up is simply incorrect.