MPG drop after header install
06-04-2012, 03:59 PM
#21
Teching In
Join Date: Jun 2012
Location: San Antonio, Tx
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Headers change the way an engine breathes and a retune is necessary to unlock all the gains and retain mileage. Mileage should actually improve with headers on a good tune. Good luck.
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zblee
GM Engine & Exhaust Performance
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08-03-2015 03:45 AM
