yeh that is exactly the same thing that happens to mine, the little drops of water are a dirty black and on if your tip points down jsut a tad it leaves little black spit marks yuk, but luckily they evapourate so my parents dont cut it haha
i have the stock muffler on mine too, i think it is just all the carbon and black gunk plastered to the insides of the muffler that is black and jsut gets spat out
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BlackRA28
you said it drift on..........
(on a wet surface it doesnt matter if uve only got 50kw:) )