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 ...
Callaway engineers are hard at work developing the company's latest Supercharged versions of 2014 GM SportTrucks, after receiving their first 2014 Chevrolet Silverado and GMC Sierra trucks this ...
Get the latest car news, reviews, and features.