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I always figured it was to assist in cooling.
That the exhaust would pull cool air through the fins around the head.
That's my theory anyways. Guess we will find out the truth soon
Alex
 

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Hey i have one of these sleds as well 1982 ski-doo blizzard mx it has the exact same thing ski-doo refers to it as the "forced flow air system." Its for performance. The tube forces cold air into the end pipe of the exhaust. A hot engine with a warm pipe runs the best.
 
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