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i would say it just means the side the flame comes out flows more than the other side and the flame just isn't big or strong enough to come out both sides
if it is a straight through exhaust yes.. if you have a single canister with 2 exits it most likely will not, and if it does it will come out of the free flowing side...
its coming out of only one side because there is unburnt fuel from a chamber on that side... misfiring cylinder on that side...