991 GT3 Cup
Porsche introduced the 991 GT3 Cup for the 2013 Porsche Supercup season. Like the 991 road car, its improvements over the 997
model include revised aerodynamics, an improved rollcage, new wheels and a revised chassis. The 991 model retains the 3.8L flat-6 engine.


991 RSR
In 2013, Porsche introduced the newest version of the RSR based on the 991 model for the LM GTE category.
Because the 991 GT3 was not in production at the time of the announcement, Porsche was forced to homologate it based on the
911 Carrera model. The 991 RSR includes revised aerodynamics, a lighter gearbox and a new, lower suspension.
For the 2013 season, Porsche retained the Metzger engine of the 997 GT3 RSR model. Manthey Racing was chosen to run the
cars in the FIA World Endurance Championship; the team achieved its best success at the 2013 24 Hours of Le Mans where the
991 RSR finished 1-2 in the GT class. For 2014, Porsche announced that it partnered with CORE Autosport to run 2 Porsche 911
RSRs in the United SportsCar Championship (under the Porsche North America team name).
Team Falken Tire also announced that it would be running a 911 RSR from Sebring onwards.
Manthey Racing will continue to run two 911 RSRs in the WEC.


911 GT America
Porsche also announced a variant of the 991 GT3 Cup car for the United SportsCar Championship known as the 911 GT America.
The car is homologated exclusively for the Grand-Touring Daytona category of the series. Upgrades over the regular Cup car
include improved aerodynamics, a bigger 4.0L flat-six engine, a new gearbox, a different safety cell, new brakes and reliability
upgrades for endurance racing.


(The first 991 test version that hit the circuit)