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Hennessy wastes no time in supercharging the 2015 Cadillac Escalade

The ink is still drying on the all-new 2015 Cadillac Escalade sales brochures, but that hasn't stopped Texas-based Hennessey Performance (HPE) from leaping out of the gate with its own high-performance variant. In stock form, the big fourth-generation Cadillac flagship arrives with a new small block naturally aspirated 6.2-liter Ecotec3 V8 delivering 420 horsepower and 460 pound-feet of torque. Fresh out of the showroom, the 5,900-pound SUV will sprint to 60 mph in 5.9 seconds.
While that is plenty fast for some owners, others don't want to be shamed by a 550 horsepower Mercedes-Benz GL63 AMG or a 510 horsepower Land Rover Range Rover Sport - both will leave the stock Escalade at a stoplight.
The team at HPE has come to the rescue with its HPE550 supercharger upgrade, which includes a belt-driven supercharger, air-to-water intercooler, recalibrated engine management software and a three-year/36,000 mile powertrain warranty. With 6 psi of boost, the direct-injected 6.2-liter is tuned to deliver an impressive 557 horsepower and 542 pound-feet of torque - gains of 32 percent and 18 percent, respectively, over stock. Although HPE isn't releasing performance figures as of yet, our math says that should be enough power to put the two Europeans in the Cadillac's rearview mirror. The company also offers a set of 20-inch lightweight H10 forged monoblock wheels, to further improve performance.

Weekly Recap: Automakers rethink the definition of luxury

Variety is the spice of life, but it's becoming a prerequisite for luxury carmakers in the ultra-competitive US market. The Detroit Auto Show was strong evidence of this reality. It's not enough to offer attractive and well-appointed cars and SUVs anymore. Luxury brands that want to be competitive need to invest in everything from high-powered supercars to clever hybrids. To be relevant, you need to be green and mean – and everything in between. As General Motors product chief Mark Reuss said after the reveal of the 640-horsepower Cadillac CTS-V: "We are not leaving anything on the table." He was speaking for Cadillac, but he might as well have been speaking for the luxury car market. The CTS-V debuted in Detroit about an hour after Lexus surprised showgoers with the reveal of the RC F GT3 race car and then announced ambitious plans to return to competitive racing. That almost overshadowed the fact Lexus had just revealed another potent addition to its growing F line, the 467-hp GS F. View 20 Photos But for luxury brands, it's not just about maximum horsepower for well-heeled enthusiasts or decadent amenities for the Grey Poupon set. Strong competition from all corners has forced automakers to refine and expand their lineups in ways unforeseen even a few years ago. Case in point: Mercedes-Benz finally has an answer to the BMW X6, rolling out the GLE coupe in Detroit. The X6, which blends coupe-like styling cues with some of the functionality of an SUV, debuted in 2008. Back then it was a punchline, but seven years and more than 260,000 sales later, the X6's success has compelled Benz to respond. Mercedes – one of the strongest proponents of diesel technology – also debuted the C350 plug-in hybrid sedan, which promises a range of 20 miles on electricity, though fuel economy figures were not announced. The car pairs Mercedes' well-received 208-hp turbocharged four-cylinder with an electric motor for total output of 275 hp and 443 pound-feet of torque. Meanwhile, Infiniti will add the Q30 hatchback to its lineup by the end of the year, new president Roland Kruger reiterated in Detroit. It's expected to be joined by a crossover variant, and the additions will help strengthen Infiniti in the United States and abroad. "While we're expanding our product line, we're also expanding our market reach," he said. That's something echoed by Jaguar executives, who are preparing to launch the brand's first crossover, the F-Pace, in 2016.

Cadillac can't keep up with Escalade demand, can't move its sedans

No matter how much Cadillac revitalizes its lineup and its image, it seems that all consumers want is the Escalade. In fact, Automotive News reports that General Motors can't keep up with demand for the fullsize luxury SUV, despite sticker prices that start at over $70,000 and approach six figures at the top end of the spectrum. Contrast that with sedans like the ATS and CTS, which are far cheaper but which Cadillac hasn't been able to move fast enough to keep up with production, prompting both the manufacturer and dealers to offer substantial incentives to keep them from piling up. Cadillac had been resisting a price cut of the ATS or CTS, lest it hurt resale values – itself a factor that could explain consumers' reluctance to buy them in the first place – but been offering subsidized leases, discounted financing, rebates and cheaper options. Combined with incentives from individual dealers, according to AN, buyers can be looking at five-figure discounts on buying a new Cadillac sedan. And now, finally, it seems the CTS will indeed get a little bit off its bottom line. Yet GM has been producing the ATS and CTS at rates that their sales can't keep up with. The automaker was forced to idle the plant in Lansing, MI, where it assembles the ATS and CTS for six weeks starting this past December. And since it reopened late in January, it's been reduced to a single shift as dealers try to move the metal they've already got. Meanwhile the plant in Arlington, TX, that produces the Escalade and its Chevy and GMC siblings has been running on overtime, with three shifts throughout the week and even into the weekend to keep up with demand. Profitable as it's been for Cadillac and GM, though, the Escalade does not represent the future of where it wants to take the brand - separating the Escalade as almost a brand unto itself that's been left out of the company's new naming scheme. If only it could make its sedans as successful as its fullsize SUVs, it'll be all set.