Enhancing performance of the 6.6L Duramax L5P diesel engine that powers '17-to-current GMC and Chevrolet trucks is not an easy proposition. General Motors' calibration engineers have made it very ...
Last month we left you with our amped-up 2009 GMC LMM Duramax; proudly huffing on a blend of water-methanol thanks to the Gale Banks Engineering Double-Shot Injection system. On the rollers, our LMM ...
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