― The 2013 Cadillac ATS is Cadillac's new luxury compact sports sedan. The new ATS will compete against the BMW 3-series, Infiniti G, Mercedes-Benz C Class, and Audi A4. The ATS will take the slot below the bigger Cadillac CTS. ∙ There will be three engine choices to choose from. The base model car will come with a 2.5L four-cylinder engine producing 200 horsepower and 188 lb-ft of torque. A 2.0L turbo four-cylinder producing 270 horsepower. The last choice is a 3.6L V6 producing 318 [...].