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  1. U

    I added a Muffler, in Disguise!!

    The specs for the donaldson show a back pressure of 1in of Hg @ 712 cfm. The Multifuel would need to be running 15 pounds of boost and 100% volumetric efficiency to acheive that flow. 1in of mercury is about the same as 1/2 psi. Resitance drops as the square of the decrease in flow and a deuce...
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