MPG drop after header install

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06-04-2012 | 04:59 PM

#21

heartbeatpower

Teching In

Joined: Jun 2012

Posts: 16

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From: San Antonio, Tx

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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06-09-2012 | 09:57 PM

#22

bluebommer07

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Joined: Jun 2010

Posts: 503

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From: donaldsonville,la

i went from 18.9 stock to 18.4 with tune then 18.3 with retune and cam according to the dic in my truck lol

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