870 horsepower. The Porsche monster that the factory never dared to build — until one Turkish tuner did it anyway.
The Car Porsche Never Built
The Porsche 992 GT3 RS is, by any reasonable measure, already a finished product. A 4.0-litre naturally aspirated flat-six spinning to 9,000 rpm, 525 horsepower from the factory, a wing borrowed from motorsport, and a chassis so perfectly tuned that it can lap the Nürburgring faster than many hypercars. Porsche spent years perfecting this machine. The answer to “more power” was always meant to be the GT2 RS — the twin-turbo widowmaker that keeps saner drivers awake at night.
ESMotor, a Turkish tuning house, looked at both cars and decided to combine their philosophies. The result is the world’s first twin-turbocharged 992 GT3 RS: a car that retains every millimetre of the GT3’s high-revving, naturally aspirated soul, then adds forced induction on top. On paper it shouldn’t work. In practice, it’s a world-record holder.
“Who in the world puts twin-turbos on a GT3 RS? Nobody. Because it’s not supposed to make sense.”
Under the Skin
The engineering challenge was immense. The GT3 RS engine runs a compression ratio of 13.3:1 — one of the highest ever found in a production sports car. Forced induction and high compression are historically a combustion disaster waiting to happen. ESMotor fitted a pair of Turbosmart 6466 mirror-image turbochargers backed by stainless steel headers and a titanium X-pipe exhaust system. Crucially, the original 4.0-litre engine block was retained entirely — no lower-compression internals, no engine swap.
Heat management was solved through a custom water-to-air charge cooler system with dedicated radiators and a 3D-printed intake manifold designed specifically for this application. The $75,000 conversion kit is, remarkably, fully reversible — meaning the car can return to factory specification at will.
What’s in the Kit
- Turbosmart 6466 mirror-image twin turbochargers, custom-mapped
- Original 4.0-litre flat-six retained, 13.3:1 compression ratio preserved
- Stainless steel headers with titanium X-pipe exhaust system
- Custom water-to-air charge cooling with dedicated radiators
- 3D-printed intake manifold engineered for this specific application
- Fully reversible conversion — factory spec restorable at any time
- $75,000 conversion cost
The Numbers
On the dyno, the results were staggering. A stock 992 GT3 RS puts roughly 450 horsepower to the rear wheels. ESMotor’s twin-turbo version recorded 794 rear-wheel horsepower — 270hp more at the wheel than the factory car produces at the crank. In British brake horsepower, that equates to approximately 873hp. Torque stands at 500 lb-ft at the ground, rising across a linear curve that preserves the original engine’s progressive character.
On the strip, the gap between the stock and twin-turbo cars is enormous by drag racing standards. The 100–200 kph sprint in 4.57 seconds is a certified world record for the 992 GT3 RS platform, placing it firmly in hypercar territory for straight-line acceleration.
Performance Figures
- 873 brake horsepower (vs. 525hp stock)
- 794 rear-wheel horsepower — 270hp more than factory output at the crank
- 500 lb-ft torque at the wheels, linear curve
- 100–200 kph: 4.57 seconds — world record for the 992 GT3 RS platform
- Quarter mile: 10.59 seconds @ 143 mph (vs. 11.21 seconds @ 126 mph stock)
- Redline: 9,000 rpm — completely unchanged
Still a GT3 RS at Heart
What makes this build genuinely remarkable — and genuinely different from simply buying a GT2 RS — is what it kept. The 9,000 rpm redline is untouched. The iconic flat-six soundtrack, that spine-tingling mechanical wail that GT3 owners buy the car for, survives intact.
Reviewers who drove the finished car noted that during light cruising it behaves exactly like a factory unit, indistinguishable from a stock GT3 RS in traffic. Then you pin the throttle. The turbos whistle into life behind the driver, boost floods the engine, and what was already a focused, high-revving sports car transforms into something that belongs alongside dedicated hypercars.
The throttle response remains instant — one-to-one, with none of the lag associated with traditional turbocharger setups. The car became, in essence, a GT2.5 RS: the distilled combination of two Porsche philosophies that the factory itself has never officially produced.
“It retains its one-to-one throttle response and iconic 9,000 rpm scream — avoiding the muffled exhaust note often associated with turbocharging.”
The Verdict
ESMotor’s twin-turbo 992 GT3 RS is a provocative piece of engineering. It answers a question nobody at Porsche was willing to ask officially, and it does so with enough technical rigour — world records, a reversible kit, preserved character — to silence most critics. Whether it’s sacrilege or the ultimate expression of what the GT3 RS could be depends entirely on your philosophy.
What isn’t debatable is the result: 870 horsepower, a 4.57-second 100–200 kph sprint, and a car that still sounds exactly like a GT3 RS at full chat. The factory never built this machine. Someone did it anyway — and they built it better than anyone had the right to expect.
See this car in action on the Officially Gassed – OG YouTube channel.
