The Porsche 911 GT3 is having some issues right now, but Porsche is already nearing the final stages of development on the GT3's harder-core companion: the 2015 Porsche 911 GT3 RS. These are the first spy shots of the car in testing.
Spied largely undisguised, the new GT3 RS looks sinister in its all-back exterior, its aggressive aerodynamics and large fixed rear wing making it clear this 911's about business first--and that business happens at the track.

Visual differences from the standard GT3 include a slightly widened track to accommodate wider wheels and tires, a larger lip around the front spoiler, modified rear fender and bumper air extraction paths, and, of course, the much larger rear wing.

Expectations for the 2015 GT3 RS include weight reduction, extra power and responsiveness, and an even more focused chassis tune. The current 2014 911 GT3 weighs just 3,152 pounds--relatively svelte for a modern car of its footprint and capability--so the GT3 RS is likely to be at or just under the 3,100-pound mark if Porsche's engineers can shave more weight through use of more carbon fiber panels, a synthetic rear window, and a somewhat more spartan cabin.

A shorter final drive ratio could bring the GT3 RS's gearing into more track-suited ranges (though it will also lower the top speed slightly). The GT3's 475-horsepower 3.8-liter may grow more powerful, as well, though it may be tuned for greater responsiveness instead, perhaps through use of lighter internal components and/or a lightened flywheel.