What is a Tunnel-Exit Snowmobile Exhaust?

In this video, Junior explains how the Deep Snow (Tunnel Exit) Snowmobile Exhaust works and what the benefits are.
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[@kasey200]

where did you put the 7s battery

[@michaelunger926]

the boys up in revelstoke could sure use the mod, is this 1 of the reasons why they are fouling pkugs?