In this Top Gear segment, Top Gear crew put Audi Q7 against the Volvo XC90. The 2007 Audi Q7 is claimed to be the world’s most powerful diesel passenger car, sports a 6L V12 engine which produces 500hp and 738 ft-lb torque, rocketing from 0-60 in just 5.5 seconds and achieving a top speed of 155mph. Video…