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Boxster soot


Vehicle Information: Year: 2000; Engine (type, size, modifications): 2.7; Total Mileage: 33,000;

Hello, I have a 2000 Boxster I bought a yeay ago with 18,000 miles. It now has 33,000. The problem is that after driving a short distance the back lower portion of the car gets covered with a fine black soot. However the exhaust pipe is perfectly clean.I have never driven this car hard. What can I do? Any thoughts on this would be appreciated.

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