Cadillac announced today it will return to racing in 2011 with a race-prepared version of its CTS-V Coupe competing in the Sports Car Club of America World Challenge, North America's top production-based racecar series. The move returns Cadillac to a series where it competed from 2004 to 2007. Competing in the GT Class with the CTS-V Sport Sedan, Cadillac captured the Manufacturer's Championship in 2005 and 2007 and the Driver's Championship in 2005. Cadillac will field...