This really shouldn't come as any surprise, but it's still great news nonetheless. Up until now, there wasn't any real indication as to what engine will be utilized for the upcoming Cadillac CTS-V. There were a few rumors that GM had decided to go with the Corvette Z06's supercharged 6.2-liter V8, but again, nothing was confirmed. Today, however, our spy photographers managed to snap these first images of a CTS-V test mule.

Based on their findings and consultations with a few engineers, it appears that this future BMW M5 fighter has a twin-turbo V8. Specific clues include the visible cooling fins on what appear to be a pair of intercoolers behind the intakes on both corners of the front bumper. Going with this setup actually makes sense for GM because it will likely allow the new CTS-V to achieve the desired performance while keeping fuel economy in check and, at the same time, keep the Z06's exclusiveness intact. But remember, the new CTS-V will need to produce at least 550-560 horsepower in order to take on both the M5 and Mercedes E63 AMG.

Also note this prototype features some large brake calipers, two-piece brake rotors, high performance wheels, huge rear tires, and a quad tip exhaust system. Expect the 2016 CTS-V to debut sometime in the middle of next year.