Porsche 911 GT3 S/C Opens the Roof on 4.0L Flat Six Power
By FINALLY OFFLINE | 4/15/2026
The Porsche 911 GT3 S/C is the first GT3 variant to combine open roof driving with the naturally aspirated 4.0 liter flat six and a manual only drivetrain. WLTP figures show 310 g/km CO2 with zero hybridization, positioning it as one of the final pure combustion GT cars from Weissach.
Key Points
- First GT3 variant with open roof and manual only drivetrain in 911 history
- Naturally aspirated 4.0L flat six with 310 g/km CO2 and zero hybridization
- Expected pricing between GT3 Touring at $185K and 991 Speedster at $274K
## 4.0 Liters, Manual Only, Open Roof. Porsche Made the Car Nobody Asked For.
The 911 GT3 S/C is the first time Porsche has put GT3 level performance into a car you can drive with the sky above your head. The naturally aspirated 4.0 liter flat six produces over 500 horsepower. The only transmission available is a six speed manual. The roof comes off. That combination has never existed in a production Porsche, and it exists now because the 992 generation is ending and Weissach is saying goodbye to the combustion purist in the most aggressive way possible.
## 13.7 L/100km. The Emissions Number That Proves This Car Has No Hybrid Compromise.
The preliminary WLTP figures tell you everything about where this car sits in the lineup. CO2 emissions of 310 g/km place it in Class G, the highest emissions category in Europe. There is no mild hybrid. No electric motor. No regenerative braking to massage the fuel consumption number. Porsche put a naturally aspirated engine in a car that will be sold in a regulatory environment actively hostile to naturally aspirated engines. That decision is the entire thesis of the GT3 S/C; it is a mechanical statement made while the window is still open.
## The Cabriolet That Weighs Like a Coupe. Almost.
Porsche describes the GT3 S/C as "lightweight in spirit," which is the kind of phrase that hides an engineering story. Removing a fixed roof from a GT3 while maintaining the structural rigidity required for track use means reinforcing the chassis floor, the A pillars, and the rear subframe. The 991 GT3 RS weighed 1,430 kg. The 992 GT3 weighs 1,435 kg. A standard 992 Cabriolet adds roughly 70 kg over the coupe. If Porsche kept the penalty under 50 kg here, that required carbon fiber reinforcements in the sills and a modified rear tonneau mechanism that likely adds cost but saves grams per square centimeter.
## Six Speed Manual in a Convertible GT Car. Porsche Did Not Offer PDK.
The manual only decision is the sharpest detail. PDK is faster around a track. PDK shifts in 40 milliseconds. PDK is what 72% of GT3 buyers chose when given the option. Porsche removed the option entirely. That means the GT3 S/C is not designed for lap time optimization. It is designed for feel. The heel toe downshift into Turn 3. The mechanical engagement of physically selecting a gear while wind noise replaces the cabin hush. Porsche made a car explicitly for the act of driving, not the result of driving.
## Between the GT3 Touring and the Speedster. That Is Where This Sits.
The GT3 Touring offered manual and subtlety. The 991 Speedster offered open air and a fixed wing. The GT3 S/C merges both. It will likely be priced above the GT3 Touring (approximately $185,000) and below the 991 Speedster, which reached $274,500. Expect allocation lists that are already full. Porsche will build this car in limited numbers because the 992 platform ends production within eighteen months. The Taycan showed where Porsche is going. The GT3 S/C is where Porsche has been. Both of those things deserve documentation.
## $200K, No Hybrid, No PDK. This Is the 992 Generation Farewell.
The GT3 S/C is a 4.0 liter, naturally aspirated, manual only, open roof sports car released into a market where electrification is mandatory. Porsche built it because the 992 is the last generation where this configuration is legal. The 310 g/km CO2 number will not pass future emissions thresholds. The lack of hybridization will not meet upcoming EU regulations. Jerry Seinfeld will buy one. Magnus Walker will buy one. And in ten years, this will be the car that collectors cite as the moment Porsche knew the combustion era was ending and chose to celebrate it.
Topics: porsche, 911-gt3, porsche-911, flat-six, manual-transmission, sports-car, convertible, weissach, track-car, combustion