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"  LAP TIMES:  Carrera S: 1:37.09 secGT3 RS: 1:33.14 sec   The Porsche 911 Carrera S and its evil twin, the GT3 RS, share the same famed rear-engine 911 profile. The GT3 RS stands slightly wider and lower, and features a lower lip spoiler up front and a pronounced wing on the rear deck. Probably the bright M&amp;amp;amp;M-green paint job is what really sets the RS apart from the Carrera S.   But the devil is always in the details.   If you haven&amp;#039;t checked the engine specs listed nearby, you&amp;#039;d know \u2014 with the first twist of the ignition key \u2014 that the Carrera S and the GT3 RS do not share the same powerplant. The S has a strong, but muted engine note. The RS spins to life with authority and makes its presence known, thanks to a thundering crackle through the exhaust. The road-going 911 is equipped with a 3.8-liter flat-6 rated at 355 bhp and 295 lb.-ft. of torque. And the more potent twin is armed with a different, race-bred 3.6-liter flat-6 capable of pumping out 415 bhp and 300 lb.-ft. of torque. Moreover, the RS&amp;#039;s different engine fitment also calls for a 6-speed manual with slightly taller gearing in the lower ratios to take advantage of the car&amp;#039;s higher 8400-rpm redline.   To turn the Carrera S into a worthy track racer, the GT3 RS takes the same basic front MacPherson strut and rear multilink suspension setup and firms it up with more aggressive springs and shocks. The Porsche Active Suspension Management (PASM) can already change the RS&amp;#039;s ride character on the fly with a push of button in the cockpit. But to allow additional fine-tuning of the suspension on the track, front and rear struts have external threads and spring perches for ride-height adjustments. Further, at the rear are unique split track-control arms; metal bushings replace rubber ones for more precise wheel location at speed. Both front and rear anti-roll bars are also adjustable.   The GT3 RS is about 80 lb. lighter, thanks in part to deleting the rear seats. The Porsche Ceramic Composite Brakes (PCCBs) on the RS are 50 percent lighter than the stock rotors, reducing unsprung mass by 34.4 lb. The combination of weight savings and more horsepower equates to better acceleration numbers.   Zero to 60 mph in the RS is clocked at 3.9 sec., which is 0.2 sec. faster than the Carrera S. But as the speed builds the high-revving RS engine pulls more aggressively, thanks to a variable-volume intake system that switches over at 6350 rpm. The car pushes past the 100-mph mark with a 1.3-sec. advantage. The quarter-mile is covered in 12.1 sec. at 116.6 mph, 0.5 sec. and almost 5 mph faster than the Carrera S. In the handling department, the RS again edges out the stock S with 1.04g on the skidpad, and travels more than 3 mph faster through the slalom course. In brake tests, the GT3 RS actually needed a few feet longer to stop from 60 and 80 mph. This is perhaps due to the PCCBs not reaching their most effective operating temperature.   Of course, warming up the brakes is never a problem at Willow Springs. Right after Millen lapped the GT3 RS nearly 4 sec. quicker than the Carrera S, he noted: &amp;quot;The brakes are great. It got better as the laps went on.&amp;quot; He is able to drive deeper than the Carrera S into the corners. The data showed that significant time was saved here in Turns 1, 2 and 3. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.roadandtrack.com/new-cars/car-comparison-tests/reviews/a20267/evil-twins-porsche-911-carrera-s-vs-gt3-rs/>