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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.

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Renowned performance tuning company, Callaway, must have a lot of cargo to haul around these days. First, it teased us with the Corvette Stingray Shooting Brake back in March, and now it is getting to work on the all-new 2014 Chevrolet Silverado and GMC Sierra trucks.

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