Posted by Brandon March 2, 2008 Audi Q7 V12 TDI: the most powerful diesel-powered passenger vehicle (500 HP and 757.5 lb-ft of torque!?) Audi Q7 V12 TDI: the most powerful diesel-powered passenger vehicle (500 HP and 757.5 lb-ft of torque!?) Share this:TwitterFacebookPocketPinterest