Land Rover LR4Eagerly anticipated debuts hallmarked the first day of the New York Auto Show. Among the showstoppers was an all-new higher-powered E-Class sedan and coupe from Mercedes-Benz. The new generation E63 AMG sports a 6.3-liter V-8 (518 horsepower), along with a seven-speed transmission with multi-clutch technology. Two new hybrid models, an E series and an ML SUV, to augment MB’s diesel approach to alternative fuel bowed, as well. Also, as a concept, MB showed a luxurious four-cylinder diesel dubbed the Vision E250 BlueTEC that the company hopes will entice North American buyers to get on the diesel bandwagon.

BMW has opened the workshop doors of its high-performance M program for its popular crossovers, the X5 and X6. The X6 M was unveiled at show looking considerably beefier that the standard version. A planned test drive by Elite Traveler will tell the rest of the tale of its new twin-turbocharged 4.4-liter V-8.

Cadillac showed an intriguing CTS wagon package that will be available in either a 3.6 or 3.0-liter direct-injection V6, a revamped SRX midsize crossover. The 3.0-liter direct injection and 2.8-liter turbo-charged V6 engine choices will deliver impressive performance and efficiency, according to the company.

Updated models for the Range Rover (including a special leather-clad Autobiography version), Range Rover Sport and Land Rover LR4 were on offer from Land Rover. All three new models use a 5-liter V8 power plant and featured updated exteriors.

Everyone expected to see Porsche’s 911 GT3 debut at the show and the $112,000 car did not disappoint. The 2010 GT3 rocks a beefier 3.8-liter six (435 horsepower) with increased torque. It jumps from 0 to 60mph in 4 seconds and can reach a top speed of 194 mph.