For the 2007 911 GT3, engineers have managed to crank 415 horsepower at 7,600 rpm and 300 lb.-ft. of torque from a 3.6-liter, naturally aspirated six-cylinder engine that achieves and EPA-rated 17/24 mpg and LEVII emissions status. Selecting Sport mode unleashes an extra 18 lb.-ft. of torque between 3,000 and 4,000 rpm. Featuring dual overhead cams, 24 valves, and variable-valve timing, the 3.6 does its part to push the 3,075-lb. GT3 (more than 400 pounds lighter than the 911 Turbo) to 60 mph in only 4.1 seconds, with a top speed of 193 mph. A six-speed manual transmission is standard, as are a locking differential, 13.78-inch vented and cross-drilled rotors, traction control, and Pirelli PZero Corsa tires measuring 235/35R19 up front and 305/30R19 out back.