Mid-Year Cadillac CTS-V Could Make up to 500-HP

Cadillac's ultra-hot 2004 CTS-V, that sports a 400-hp 5.7-L LS-6 V8 pulled directly out of the wild and wooly Corvette Z06, just might get a mid-year engine upgrade to nothing less than 500-hp. At least that's the rumor running around GM circles lately.