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#12
Mon, April 20th, 2009, 06:45 PM
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Good post, Lars!
I think you're right about the OBDII systems. I'm sure the PCMs are calibrated to "expect" the backpressure of a muffler and to work with it. When that backpressure is missing, I bet they try to compensate by reducing the outflow (which probably cuts the inflow of gas and air - so, less power). - Jack 
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