This issue of Performance in Motion features: Petersen Automotive Museum, "Radillac" the 1947 Cadillac, Edge Performance 100 hp boost for diesel trucks, Studebaker: Different by Design, 1955 Chevy, Stiffer law won't stop street racing, SEMA research: Tonneau Covers Save Gas, Rock N Ray Michaels Dream Cruise, and the Reluctant Passenger's "Car Nut Spotting 101."