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As an additional point of reference, the Tacoma poster saw a significant improvement in fuel economy. His "old record best of 28.9" improved to 30.6 immediately. Others have seen the same thing, such as the attached FE log of a Ford F150 with a 4.2L V6. The guy chopped off the OEM muffler and installed a Flowmaster 50 series and basic end pipe. 1MPG is a decent improvement for just a muffler!
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