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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
By the looks of it I think its just unburnt fuel. I notice that sometimes it spits a flame out too. So I personally wouldnt be worried but maybe get a rolling road set up and check the fuel air mixture etc to see if it is running rich a in the long run this isnt what you want as it has detremental effects on the engine