This 2015 Porsche 911 GT3 Cup is a 991.1-generation factory race car that has been used primarily for Club-style events. Power is provided by a 3.8-liter flat-six linked with a six-speed sequential transaxle and a limited-slip differential, and equipment includes the Accessory Package, an air-jack system, a rear wing, tow hooks, xenon headlights, 18″ center-lock wheels, a Sabelt racing harness, a roll cage, a fuel cell, and a fire-suppression system along with a Bosch Motorsport anti-lock system, and the engine and gearbox were reportedly rebuilt at 11,300 kilometers along with installation of a replacement clutch. Acquired by the current owner in 2022, and this 991.1 GT3 Cup is now offered in Southbury, Connecticut, with service records, spare parts, an extra set of wheels, and a bill of sale. Compared to the 997, the 991-generation GT3 Cup featured a 100mm-extended wheelbase and aluminum-steel hybrid construction. The doors, engine cover, and rescue hatch in the roof are all composed of carbon-reinforced plastic (CFRP), and polycarbonate windows were fitted in place of the side and rear glass. The front bodywork was revised for the Cup, and a roll bar was integrated along with tow points and roof-mounted connectors for recovery eye bolts. The bodywork of this example is finished in white beneath a red, black, and gray camouflage-style vinyl livery. Blemishes are noted on the bodywork, and scuffs are visible on the driver side. The right-side lower rocker panel was replaced in September 2021. Silver-finished 18″ center-lock forged alloy wheels are mounted with Pirelli P Zero tires measuring 27/65-18 up front and 31/71-18 at the rear. The front axle design is a MacPherson strut-type axle with aluminum transverse control arms, and the rear axle uses a multi-link setup, and adjustable coilovers, uniball joints, and adjustable double-blade-style roll bars. Single-piece 380mm steel rotors are matched with six-piston front and four-piston rear aluminum calipers, and the system has two main hydraulic cylinders, adjustable brake balance, and a Bosch Motorsports anti-lock system. The car also features air jacks and hydraulic power steering, and a control arm was replaced in 2025. Noise insulation is omitted for weight reduction reasons. The starter battery and the fire system are installed in the passenger footwell. The driver is provided an adjustable Recaro racing seat along with a Sabelt racing harness, colored controls, and paddle shifters. The fire-suppression system was recharged in March 2025, although notes indicate that the harnesses, seat, and fire system may be out of date for certain race inspections. The steering wheel fronts a Porsche-branded Cosworth data logger with colored display. The DME readout indicates ~17k kilometers and ~132 hours, and the seller estimates total chassis figures of ~30,500 kilometers and 375 hours. Records indicate approximately 5,473 kilometers and 43.18 hours have been added since the engine and gearbox rebuild. Up front is a 100l fuel cell. The Accessory Package added a fuel tank defueling hose as well as a car diagnosis and interface cable. The water-cooled 3.8L flat-six was factory rated at 460 horsepower. It features a dry-sump lubrication system including an engine-mounted oil tank, an oil-water heat exchanger integrated in the cooling circuit for oil cooling, and Bosch Motronic MS4.6 engine management. The engine and gearbox were rebuilt in 2021. Power is routed to the rear wheels through a G91/72 six-speed sequential transaxle and a limited-slip differential. The clutch and throwout bearing were removed and replaced in October 2025. Records convey as depicted in the gallery. The car is sold on a bill of sale and is not intended for street use.