Autocar is reporting that Porsche's new 911 GT3 will debut at the 2013 Geneva Motor Show next March. Based on the current 991 911, it should drop 80 pounds and gain 15 horsepower over the current GT3. The extra horsepower—which should hover around 450—will come from Porsche's 3.8-liter flat-six engine, rather than the 4.0-liter engine from the current GT3 RS 4.0. The 3.8 should motivate the 991 GT3 to 60 miles per hour in under four seconds. Top speed will also be increased to nearly 200 miles per hour.
