NEW YORK — The 2019 Porsche 911 GT3 RS made its debut just a few weeks ago at the 2018 Geneva Motor Show. It’s faster and more powerful than ever before thanks to extensive use of carbon fiber and a 520-horsepower 4.0-liter flat-six screamer mounted out back. For the 2018 New York Auto Show, Porsche’s GT division is rolling out the GT3 RS Weissach Package, an $18,000 carbon-fiber weight-loss program. This is the first time the Weissach Package has been available on a 911 GT3 RS. The Weissach name really made its mark as an eye-watering $84,000 option on the Porsche 918 Spyder. The diet helped the 918 go from 0 to 60 mph in just 2.6 seconds and 124 mph in just 7.2 seconds. Porsche hasn’t announced performance figures for the GT3 RS with the Weissach Package, but expect 0-60 times to fall below 3 seconds.