C6 Corvette owners wanting to seriously upgrade have quite a few choices. Companies like Lingenfelter, Callaway, and Pratt & Miller can turn the C6 into a vehicle capable of taking on the world's best supercars. Not to be left out, Detroit-based Specter Werkes/Sports launched its GTR package for the C6 Corvette last week that features an extensive carbon fiber widebody kit, heat extractor hood, Stoptech brakes, Forgeline or HRE wheels, Corsa exhaust system and more. The customer of the first C6 GTR also opted for Specter's Matrix II engine package that includes a stroker engine increasing displacement from 6.2L to 6.8L and boosting horsepower to 545 bhp and torque to 530 lb-ft. More details on Specter's GTR package and this particular car's features can be found after the jump.