2001 Audi A6 2.7T Quattro AWD 4dr Sedan (2.7L 6cyl Turbo 5A)
Excellent engine. Any review that says the power isn't there is way off. It produces almost 100 hp/liter which is excellent. Handling matches the power as well resulting in a very fun car. Also very comfortable on the interior. However, repairs will be expensive(count on that). I replaced both turbos which was roughly $4300. A word of advice is to make sure you have a mechanic who knows audis work on the car, not the guy down the street. Love the car but don't want to end up paying for repairs.