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Old 10-29-2012, 10:27 PM   #14
Magus2727
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Join Date: Feb 2009
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Location: Salt Lake City, UT
What I Drive: 2001 MB ZX3, 2004 SY SVT ZX5

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I believe it has something to do with fresh air making it up to the valve having more oxygen than more normal exhaust air. This causes more carbon deposits. the theory that back pressure or long exhaust tubes will prevent "fresh" air from making contact with the valves. There is some discussion if this is actually true or not.
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