New Car: 2009 Cadillac CTS-V

This is it. The fastest, most powerful Cadillac ever built. The fastest, most powerful American sedan in history, for that matter. Locked, loaded, and gunning for Europe's heavy-hitting sport sedans-BMW M5, Mercedes-Benz E63 AMG, Audi RS6. Read all that again. Now pinch yourself. No, you're not dreaming. Motown-well, GM at least-has its mojo back. Meet Cadillac's monster new CTS-V. Cadzilla, if you will.Here are the raw numbers: 550 horsepower at 6200 rpm. 550 pound-feet of torque at 4000 rpm. They're only official "estimates," but as the engine under the new CTS-V's power-domed hood is fundamentally the same as the supercharged V-8 that's credited with 620-plus horsepower and at least 600 pound-feet in the hot new Corvette ZR1, you can safely assume the real SAE-certified figures will be close. "I'm confident we'll disappoint nobody with the numbers," says Ed Piatek, the CTS-V's program engineering manager.

There are no performance figures yet, but by way of context, AMG's E63 Benz nails 60 mph in 4.3 seconds. The new CTS-V weighs about the same and has at least 43 more horses and 85 pound-feet more torque. Draw your own conclusions: The car also has been extensively tested on the legendary Nrburgring Nordschliefe, and while insiders are tight-lipped on the actual lap time-for now-they will admit Cadzilla has terrorized factory hotshoes from Munich out on the daunting 13-mile road course. "People who've never been passed by a Cadillac have now had that experience," smiles Piatek.Piatek works for the GM in-house hot-shop, High Performance Vehicle Operations, headed by John Heinricy, and was the man tasked with overseeing the transformation of the COTY-winning CTS into Cadzilla. He had good raw material to work with: Unlike the previous model, the new CTS was engineered from the outset with the high-performance V-series model in mind, with extra stiffening and strengthening built in. "That was a lesson we learned with the first CTS-V," says Piatek. "If you start with this [idea] going in, there may be a small mass penalty on the base car, but there's less cost and tooling needed to do the V."

As a result, the basic CTS body structure is little altered. Most of the changes that have been made-mainly around the front and rear suspension cradles and the suspension links-are purely to handle the much higher cornering loads induced by the specially developed 19-inch Michelin Pilot Sport 2 tires and the prodigious torque output from the engine. On that last point, everything rear of the front transmission flange has been beefed up. There's a larger-diameter prop shaft, and asymmetric halfshafts (one side is a 55mm-diameter unit, the other 35mm) to help reduce wheelhop under full power launches).