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Carbon Build up

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KottonMouthTSI

15+ Year Contributor
455
5
Aug 24, 2005
Morehead City, North Carolina
Theirs Carbon build up on my exhaust tip, and in it, is all black. What causes this, I installed NGK PRP plugs, What could be the cause, shes running fine?
 
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you are running to rich...could be a vacuum leak,boost leak...when I blew a turbo hose my tail pipe was blaaaack!!!
 
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All cars run slightly rich from the factory as a safety percaution. Carbon build up on a turbo car is normal. Do a boost-leak test just incase.
 
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