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One big cat to another: a reader swaps Puma for XF

It was 2007. To be honest, at 24 years old, I wasn't really interested in the Jaguar C-XF concept car when it first appeared. I was still in that early twenties dreamworld where I would be driving the Lexus LF-A when it finally made production.

Infiniti means . . . what?

Ever since Infiniti was launched with mystifying advertising images of rocks and trees 21 years ago, Nissan Motor Co.'s luxury brand has been hard to pin down. Vehicles such as its G37, the 2011 M sedan and the QX56 SUV turn heads and win praise in buff books. But while luxury competitors such as BMW, Mercedes-Benz, Audi and Lexus have soared in consumer popularity over the past decade, Infiniti has struggled to keep up.

Spied: Porsche 911 GT3 RS

The mild redesign of Porsche's 911 range will get to the ultra-high-performance GT3 RS model, based on these spy shots. This prototype was nabbed making a cross-country U.S. dash.