What happens when you pit a Dodge Challenger SRT8 against a big and heavy luxury limousine? Any rational person would bet heavily on the lighter Challenger, but there is on small exception about the nearly 4,700-pound competitor... it happens to be the Alpine B7 with a snarling V-8 under its hood. Now, that seems like a fair challenge, but that weight difference is a tough one to overcome.

So, here we have two V-8-powered cars; one is a coupe that is built to go fast and the other is a comfortable saloon that also has a little muscle behind it. The Challenger’s 6.4-liter V-8 puts out a very respectable 470 horsepower, but the 4.4-liter, twin-turbocharged V8 under the BMW Alpina B7’s hood makes 540 German-engineered horsepower. Now things are looking a little better matched...

So, who wins: raw American muscle or the nearly 550-horsepower luxury rig that is at a 500-pound disadvantage? Watch the above video to find out.

Click past the jump to read more about the BMW Alpina B7

2013 BMW Alpina B7

2013 BMW Alpina B7 High Resolution Exterior
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Alpina has been tuning BMWs for quite some time now, and the B7 is its current flagship sedan. The Alpina B7 is based on the F01 generation BMW 7 Series, which is where the "7" in "B7" comes from.

On the outside, the Alpina B7 may look like a normal 7 Series but for a trained eye, the subtle body-kit, large Alpina wheels and the quad-exhausts don’t go unnoticed.

Pop open the hood and that is where the magic happens. The engine is a specially tuned, 4.4-liter V8 from the M5 that carries a pair of turbo. In the B7, it puts out 540 horsepower and 538 pound-feet of torque and an eight-speed automatic transmission keeps all those horses heading to the rear wheels.

The dash from 0 to 60 mph takes just 4.6 seconds in this 4,655-pound machine. Also, this being Alpina, the B7 can go well beyond the factory 7 Series 155 mph limited top speed. In fact, this behemoth will do 194 mph.

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