The GT2's engine was based on the existing 3.6 L (220 cu in) flat-6 engine, but features twin variable geometry turbochargers (as used on the 997 turbo), generating a maximum power output of at 6,500 rpm and of torque at 2,200 rpm. Unlike the 997 Turbo, the 997 GT2 uses a rear wheel drive layout for reduced weight (primarily for competing in GT2 class racing as with its predecessors), and boasts a power increase from a newly designed expansion intake manifold, and shorter turbo intake manifolds. Further, a full titanium exhaust system was fitted to the 997 GT2 contributing to reduced weight as compared to the turbo. Despite the power hike, Porsche claims fuel consumption at full throttle is improved by 15 percent compared with the 997 Turbo. The GT2 accelerates in 3.6 seconds to and in 7.4 seconds to and has top speed of . This makes it the first 911 to exceed the top speed barrier after the 1998 Porsche 911 GT1 Race Version (which is not considered to be an actual Porsche 911 due to its mid-mounted engine and overall shape). The Porsche 997 GT2 has a curb weight of . The only transmission available is a 6-speed manual.