2005 Cadillac CTS-V - 475HP-500HP LS2 As if the 400-horsepower CTS-V Series isn't enough, we photographed General Motors' Performance Division engineers testing an even higher performance version. Referred to as the CTS-V Series Plus by spectators at the Nürburgring, this CTS mule is said to be powered by a 6.0-liter V-8, and sources are estimating the horsepower to be in the 475-500 range. General Motors is aggressively testing this more powerful CTS, but production plans have not yet been confirmed. The vehicle shown here is actually an older CTS-V mule, so the hood hump should disappear in production. ----- Looks like fender flares may be in store for 2005 as well.