ok maybe i been gone to long but i coulda swore intake headers and exhuast run increased your mpg by allowing the car to breath in bettter and easing the pressure on engine through smoother exhale out the exhuast..........
Basically the more cold dense air the less fuel needed,
and reduced restrictions on exhuast means the engine can rotate wheels with less force dcreasing the need for more throttle press equalling less gas used
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