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A smoother warm air intake I can see having benefit on a particularly restrictive OEM intake.
Other breathing mods can hurt fuel economy if you over-size them. Particularly the exhaust. Your truck needs some backpressure at low RPM's to generate torque.
Headers are good if they're sized well. Too big and you lose the low end to benefit the top end.
Nail the sizing and you should see gains.
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2012 Chevrolet Cruze Eco 6MT
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