Porsche’s entire legacy is built on decades of engineering continuous improvements, and the 991.2 GT3 epitomizes this perfectly. When the 991.1 GT3 was introduced for the 2014 model year, it represented a significant leap forward over its predecessor, with a 25% stiffer structure and a completely new powertrain featuring a dual clutch transmission and a new direct-injected engine. For 2018, the GT3 was comprehensively revised, with particular emphasis on the motor, which was bumped to 4.0 liters while lighter but stronger internal components and a sophisticated new valvetrain increased the redline to a screaming 9,000 RPM. Power output rose to 500hp, a remarkable 125 horsepower per naturally-aspirated liter, all from a docile street engine with 12,000 mile oil change intervals. Of particular note is that following the 2016 facelift of the 991, the GT3 became the only naturally-aspirated car remaining in the entire 911 lineup, making the already superb motor even more special.