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i always thought that carbon on the bumper was attributed with an engine thats burning oil. I had an old civic back in the day that would get carbon on the bumper. It would go through a litre of oil every 2000k

Really given'er you get more carbon on the back than just cruising.

ninja edit: Though that car had a magnaflow catback 4-1 race header and was decatted so maybe the decat could have some impact as well? Maybe a bad cat/poorly performing cat on a car could give the same effect.
 
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