RUF Automobile ran the Boxer 8 Erprober up the Goodwood hillclimb on July 10, 2026. "Erprober" is German for "tester". The car is a running prototype of a new engine RUF has developed in-house: a 4.8-litre twin-turbo flat-eight producing approximately 1,000 hp, paired to a six-speed manual gearbox and installed in the CTR3 mid-engine chassis for validation.
Why the Boxer 8 is a bigger deal than the numbers suggest
RUF has been an independent manufacturer since the 1980s, but the engines in its cars have historically been reworked Porsche flat-sixes. The CTR Anniversary, the CTR3 Evo, the SCR all trace back to Porsche architecture at the block level, no matter how much RUF has changed above the deck. The Boxer 8 does not.
It is a bespoke RUF-designed flat-eight, built by RUF for a RUF chassis. That is the first clean-sheet engine the company has produced. The choice of a flat-eight rather than a flat-six or a V8 is telling. Flat-eight engines are structurally difficult, aerodynamically compact, and give a low centre of gravity. Ferrari built one for a Formula 1 car in 1964. Porsche has never sold one. RUF is now the only manufacturer in production with a flat-eight in a road car.
What the prototype tells us
At Goodwood the Erprober was on validation duty, not customer-facing display. The CTR3 chassis is a proven mid-engine platform, so it makes sense as a mule. What RUF was showing was the engine, not the car. Expect the Boxer 8 to appear in a production RUF within 18 to 24 months, either as a variant of the CTR3 Evo or in a new model line. The six-speed manual is not a mule-only detail; RUF confirmed the production car will retain it.
Where this leaves RUF
RUF is now one of the only remaining small European manufacturers with in-house engine capability. Pagani buys its V12 from AMG. Koenigsegg builds its own. Zenvo builds its own. Add RUF to the shortlist. That changes what RUF is, quietly. It is no longer a specialist that finishes Porsche architecture with better hardware and better paint. It is a full manufacturer with its own drivetrain.
See where the CTR3 Evo lands against the modern mid-engine field on our fastest cars list.
The basics
| RUF Boxer 8 (B8) Erprober | |
|---|---|
| Reveal | Goodwood Festival of Speed, July 10, 2026 |
| Status | Running prototype ("Erprober") |
| Engine | 4.8L twin-turbo flat-eight |
| Power | approx. 1,000 hp |
| Transmission | 6-speed manual, mid-engine |
| Chassis (prototype) | CTR3-derived mid-engine platform |
| Production car | Expected within 18-24 months |
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Sources: Goodwood 2026 live coverage (Auto Express); Goodwood 2026 preview (CarBuzz); coverage from Top Gear, Jalopnik, Hagerty, Motor1. Photography: RUF Automobile.