The flying here in New Mexico can be a lot colder than I'm used to in Louisiana. One of the challenges I've been working on was how to install dual cabin heat. My attempt to answer that challenge was to have Clint at Vetterman exhaust modify a carb heat that is shorter and will fit off the No. 1 cylinder exhaust pipe. The heat muff is 4 1/2" long. Had to remove a bit of material on one corner for clearance. Should have enough carb heat since sucking warm air across three exhaust pipes. Will proceed with two cabin heat muffs!