Stock is good, but there's always room for improvement. When GM Powertrain set out to build a Duramax-powered GMC truck to help promote its new Duramax boat engine, it turned to Diesel Power to ...
In the diesel performance realm, it’s not uncommon for general repair items to morph into high-horsepower builds. Case in point, when this ’09 GMC Sierra came into Flynn’s Shop in Alexander, Illinois, ...
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