So far most of the car makers have revealed their tricked out muscle cars for the upcoming SEMA show, but among them two big names, Corvette and Camaro, were missing. Now as it turned out, they’ve been secretly working on some good stuff!  General Motors has released this video to preview their plans for 2009 SEMA as a bunch of Chevy Corvettes and Camaros are getting prepared for the event. More details on each car will be released later.