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How does the Ugly Fix work for Detroit diesel or Cummins ?
Last Updated: 07/08/2015
The barometric pressure sensor on the engine regulates altitude and direct the EGR accordingly. (open low altitude or close high altitude)  The Ugly Fix™ works by changing the circuit flow to the ECM. The altitude of the engine is no longer a factor. Some would have you believe that this would be boost mode. Not true and it is a miss conception of terminology with our product. Boost mode is only accomplished with a barometric pressure sensor and high altitude which comes stock on the engine.

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