Both the cars are from different segments. Audi RS5 is a sedan whereas BMW X7 is a SUV. Audi RS5 comes with the same 2.9-litre twin-turbo V6 petrol engine (450PS/600Nm), mated to an 8-speed automatic transmission as the pre-facelift model. The performance sedan’s 0-100kmph time stands at 3.9 seconds with an electronically capped top speed of 250kmph. Whereas, BMW X7 is offered in just three variants in India. The xDrive30d variants are powered by a 3.0-litre turbocharged diesel engine making 265PS and 620Nm. The only petrol engine option available in India is the 3.0-litre turbo-petrol unit making 340PS and 450Nm. Both six-cylinder engines are mated to an 8-speed automatic transmission sending power to all four wheels. Moreover, we would suggest you to take a test drive before making the final decision. Follow the link and select your desired city for dealership details.Read more -Audi RS5 vs BMW X7 Comparison.