RPM is a company of special suppressants to use with tailpipes, making cars' tailpipes spit out cool fire at nighttime. Winford Bradford Rutherford, Riley, Bruce Miller, and Barry DePedal are the bearers of this sponsor at the Piston Cup races.
- The product's name is a play on "RPM", which means "Revolutions Per Minute" in a car's engine, and "P.M." as in night hours.
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