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Even with an exhaust shroud you won't stop the black soot on the rear bumper. My brother dark blue R33 had a dump-pipe style tip pointing directly at the ground and a custom made aluminium shroud, and the bumper along with the shroud still went black.

The reason for this is because when you are driving at speed (anything more than 40km/h) a low-pressure ridge is created directly behind the car which tends to "suck up" the exhaust fumes and the result is black soot on your rear bumper :)

This is also the basis for the "slip-stream" effect in motor racing.....at very high speeds the low-pressure ridge becomes a vacuum and the car behind has little to no wind resistance allowing them to gain speed quicker.

Anyway, back on track, enjoy the black soot on your bumper, you won't be able to get rid of it, ever, muahahaha

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When you wash your car, simply use some hot soapy water and an old rag to wash most of it off, then use some car polish on that area of the bumper and the next time it should simply wipe off, but you have to keep applying polish to the bumper every time you wash it.

It worked on my 33

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