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How to upgrade ’14-’16 Chevrolet & GMC 6.6L Duramax for better power and mpg

Old Mar 13, 2016 | 11:50 PM
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Information How to upgrade ’14-’16 Chevrolet & GMC 6.6L Duramax for better power and mpg

How to upgrade power, torque, and MPG in a GMC Sierra 2500HD Denali 6.6L Duramax combining tuner, cold-air intake and DPF-back exhaust.

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