Barely a month after we first told you about Callaway's plans for the new Chevrolet Silverado and GMC Sierra, the Connecticut-based tuning shop has shown its first completed model. Using a Silverado, Callaway has fitted an Eaton TVS supercharger and developed a new calibration for GM's powertrain management system. Improvements aside, we still haven't been told just how much more engine power is is available. Callaway says that information "will be released very soon." Initial targets for the 5.3-liter V8 saw a bump to 450 horsepower, up from 355 hp.
Autoblog , Callaway debuts first supercharged 2014 Silverado, Callaway debuts first supercharged 2014 Silverado
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