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A free flow exhaust can lead to poorer mpg numbers. I am unsure on other vehicles but on ford 302 motors having a single stock exhaust outlet improves upon low end torque which is what hypermilers love. When improved to a high flow true dual exhaust the low end power disappears but the high end improves 4000+ RPM.
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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