The scream of engines has joined the crack of the bat as a sonic symbol of sports. Once considered a minor regional sport, racing in all its fascinating forms has become a top attraction throughout North America. Die-cast racing cars have always been a cherished collectible. Now, thanks to motor sports' newfound popularity, these die-cast models are the hottest thing on miniature wheels. CollectingChannel's latest multimedia event, The CollectingChannel Die Cast Racer Special is an interactive guide to metal motor sports models.