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Probably. It's either mud or rust or something else that isn't good in any way.
Or at least I can't think of any way that it's a good thing.
You really need to learn what you are talking about prior to making comments of this sort. It is normal for stuff to be dripping out of the exhaust, heck even on many full sized autos there is stuff dripping (mostly condensation) from the exhaust.
On these cars, whatever does not get completely burned up during the combustion cycle of the engine ends up coming out of the exhaust. Most of the time it is oil mixed with unburnt fuel. Most of the time it is brownish in color or some other color other than that of the fuel you put in. Think about it...it is exhaust...it is dirty...
At any rate, everyone else here seems to be on the right track.
Cupooterluvr, you need to learn a bit more about this hobby and the things that make it go prior to chiming in with what amounts to "omigosh...something is wrong!"
-SkyMaxx