As GT3 RS 4.0 examples continue to soar in value and sell at the seven-figure mark, we’re taking a deep dive into one of Porsche’s most collectible cars.
The Porsche 997 GT3 RS was already a track-focused icon before Porsche Motorsport decided to up the ante with the limited-production RS 4.0. While the 997.1 GT3 RS came with a 3.6L engine and the 997.2 GT3 RS bumped displacement to 3.8L, it was the 4.0L variant that truly cemented its place in Porsche history. Launched in 2011, the GT3 RS 4.0 was a swan song for the 997 generation and a final farewell to the legendary Mezger engine in its most extreme naturally aspirated form. Just 600 examples were assembled and rolled off the production line in Stuttgart, making it rarer than most collectors and enthusiasts might assume. Compared to the 3.8, the 4.0 was more powerful, more responsive, and even more track-ready, thanks to a long list of motorsport-derived parts and lightweight tricks.
Mezger’s Influence
At the heart of Porsche’s legendary GT car is the 4.0-liter flat-six engine, the largest displacement Mezger engine Porsche ever put into a street car. German Engineer Hans Mezger’s influence traces back to Porsche’s motorsport programs, including Le Mans and F1, earning a renowned reputation for bulletproof reliability and high-revving performance. Hans himself is a mythical figure in Porsche engineering, having developed everything from the 917’s flat-12 to the turbocharged F1 engines of the 1980s. The 997 GT3 RS 4.0 is arguably his ultimate street-legal expression, a high-revving naturally aspirated masterpiece that showcases how race engineering can translate into everyday usability. Unlike modern turbocharged 911s, this one truly relies on the driver, with every gear change and throttle blip connecting you directly to the engine’s mechanical soul.
Porsche Motorsport Styling
Aesthetically, the 997 GT3 RS 4.0 features subtle but meaningful improvements over the standard 3.8 version. Either red or black graphics complemented the white-only launch color, and the front dive planes were added to increase downforce at higher speeds on the straights. Lightweight carbon fiber parts, including the front fenders, hood, and bucket seats, helped shave precious pounds off to achieve its 2,998-pound curb weight. The tall rear wing, center-lock wheels, and cup car-inspired widebody delivered both serious track presence and functional aero. Even down to the small RS 4.0 badges on the rear and on the door decals, everything about this car screamed lightweight precision.
Track-Ready Interior
Inside, the 997 GT3 RS 4.0 carried over the no-nonsense cabin from the 3.8 but turned up the motorsport cues a notch. The factory roll cage, bucket seats with racing harness upgrades, and Alcantara everywhere created a race-ready feel while keeping just enough creature comforts to make it streetable for those Friday commutes to the office. Owners who opted for the Clubsport Package got a fire extinguisher and battery kill switch, while the lightweight door pulls reminded drivers that weight savings mattered more than convenience. Despite its raw personality, the layout is quintessential Porsche: logical, clean, and focused entirely on the driving experience.
Naturally Aspirated Power & Precision
Under the rear decklid sits the naturally aspirated 4.0-liter flat-six, making 500 horsepower and 339 lb-ft of torque. It revs to a screaming 8,500 rpm, and all that power is sent directly to the rear wheels through a six-speed manual gearbox. There’s no PDK, no turbo lag, just pure, linear power and a perfectly balanced chassis. Porsche reworked the suspension and used components from the GT2 RS to improve performance. With a Nürburgring lap time of just over 7:27, it was one of the fastest production cars of its time and remains a benchmark for what a pure driver’s 911 can be. Even today, the sound and feel of that Mezger engine remain unmatched.
Limited Production & Soaring Value
With only 600 examples produced worldwide, the 997 GT3 RS 4.0 has become one of the most collectible modern Porsches on the market today. It marked the end of the Mezger era and the last manual-only GT3 RS, two key factors that have helped drive values steadily upward. In July 2025, an 842-mile example sold for a record-breaking $1.26 million at auction, confirming that this car is the holy grail for both air-cooled purists and water-cooled warriors. As more collectors recognize the 997 generation’s mixture of analog feel and modern performance, the RS 4.0’s place in Porsche’s archives only becomes more secure. Whether you see it as a museum piece or the ultimate weekend track weapon, there’s no denying this Mezger masterpiece has earned its legendary status.
Sources: Porsche/Shmee150 YouTube