Audi's 500 horsepower Q7 TDI readying for launch

It's anyone's guess whether the inventors of the original fuel-sipping TDI engines ever thought the technology would be used to enable feats of power and performance- though that's what seesms to be on the horizon. Audi has just announced that their Q7 V12 TDI model will be the most powerful diesel-powered passenger vehicle in its class.