• The 2015 Cadillac ATS-V Coupe is GM's answer to the BMW M3 and M4. We know this because recently we caught what we believe is the new Caddy Coupe high altitude testing in the Wild. When we tried to move in closer for a picture the Cadillac ATS-V Coupe took off like a bat out of hell. According to published reports the new Cadillac ATS-V Coupe will have a twin-turbocharged 3.6-liter V-6 that puts out at least 420 horsepower.