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Is it just me or is there someone else out there that washes their car and drives it a day only to find the bottom half of the exhaust tips are covered in some black substance. It comes off with a wipe of a rag but I haven't run into this before....and I worked detailing cars for over five years. ???

Is anyone else running into this? My car only has 2k miles on it and maybe it will improve or maybe I just deal with it.
 

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I know motorcycle pipes discolor due to air-fuel mixture being a bit off or the timing being a bit off (motorcycles being much more difficult to tune)...

2k and same discoloration.
 

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Talked to a guy at volkswagen customer support in Germany. He said it might be because the octaine in the gas you are using is too high. Not sure if there is validity to this but who knows.
 

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UnitedGTI said:
Talked to a guy at volkswagen customer support in Germany. He said it might be because the octaine in the gas you are using is too high. Not sure if there is validity to this but who knows.
...i could see it being too low and causing this but not too high... ???
 

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It had to do with the car not being able to burn all the fuel that goes into the chamber. Apparently over time the problem should be less intense. Once again it was a volkswagen tech so he may just be trying to make me happy and shut me up.
 

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Just buy a new exhaust system. You've got everything else, don't you? Or is this already an after-market exhaust that has shit on it? In that case, buy a new aftermarket exhaust.
 
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