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This is a very strange request--most people want LESS smoke out of a diesel. If you wanted it to happen only once in a while, you could probably work out a way to inject oil into the exhaust, downstream of the turbocharger. If you wanted black smoke permanently, you'd have to bypass the turbo...but don't do that because (1) it's illegal to mess with emissions-control equipment (on a diesel, the turbo is one of the most important emissions control devices) and (2) your truck will run horribly, if you didn't break it outright.

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15y ago
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Q: How do you make my 2000 Dodge Cummins 2500 blow out more black smoke?
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