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Probably more condensation from the exhaust flow to that side. Both tips connect to the same pipe coming from the motor, but inside that muffler there are baffles, twists, and who knows what else.
Same thing with the stock exhaust I had... Then when I changed the DP, Midpipe, and back-box smoke comes out both sides... It probably has something to do with the baffles in the back-box that send it out one way more than another.