Here’s a rather strange comparison video in which MotorTrend pits the 2011 Cadillac CTS V against the 2011 Porsche Panamera Turbo and the 2011 BMW X6M. You can easily speculate which of the three is faster on a straight line, but before you’ll check out the footage here are some quick numbers.
2011 Porsche Panamera Turbo specs : power comes from a 4.6-litre twin-turbo V8 which develops 500 HP and 568 lb-ft of torque via a seven-speed twin-clutch automatic transmission. The Panamera Turbo tips the scale at 4,486 lbs, uses an all-wheel-drive system and carries a price tag of 164,145 USD.
2011 BMW X6M specs : 555 HP and 500 lb-ft of torque provided by a 4.4-litre twin-turbo V8. Power is sent to all four wheels through a six-speed automatic gearbox. This mean looking SUV weights 5,181 lbs and costs 95,275 USD.
2011 Cadillac CTS V Wagon specs : this U.S. built model is propelled by a 6.2-litre supercharged V8 unit which unleashes 556 HP and 551 lb-ft of torque via a six-speed manual. In this case power is only sent to the rear, and total weight is 4,371 lbs. Pricing for the CTS V Wagon starts at 68,640 USD.  
Video : Cadillac CTS V Wagon vs Porsche Panamera Turbo vs BMW X6 M

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Source: MotorTrend via YouTube