Porsche’s Next Flagship Supercar Could Bring a Flat-Eight Boxer

A decade after the 918 Spyder bowed out, Porsche’s next halo car may finally be taking shape.

The project is said to carry the internal code name S1, and the most intriguing detail is not electrification or lap-time theatre, but a rumoured all-new flat-eight boxer engine.

If it reaches production, the car would give Porsche a flagship distinct from the 911 while arriving at a moment when the brand is also pushing its smaller sports-car line toward battery power.

At a glance

A halo car after the 918 Spyder

The 918 Spyder left production roughly ten years ago, and Porsche has not filled that space with a direct successor since.

That absence matters because Porsche’s flagship cars tend to do more than sit above the range.

They act as technical signposts, drawing a line between the company’s racing instincts, road-car identity and appetite for risk.

The S1 name being discussed points to something separate from the 911 family, rather than simply a more extreme version of an existing model.

That would be a significant move for Porsche, whose modern performance image is deeply tied to the 911 but not limited by it.

The flat-eight rumour changes the conversation

The standout claim is the engine.

A new flat-eight boxer would immediately give the S1 a different mechanical identity from the 911’s famous flat-six.

There are no confirmed output figures, hybrid details or performance numbers, so the appeal at this stage is about configuration and intent rather than spec-sheet dominance.

For Porsche, an eight-cylinder boxer layout would be more than a novelty.

It would signal a desire to give the car its own voice, proportions and engineering logic, instead of stretching the brand’s most recognisable sports-car formula into a higher price band.

That distinction could matter to collectors who already understand what makes Porsche special but want something rarer than another 911 derivative.

Positioned far above the core sports cars

The rumoured pricing puts the S1 in rarefied company.

A base price of around €500,000, or approximately $574,000 at current exchange rates, would make it one of Porsche’s most expensive modern road cars from the outset.

That number also suggests the car would not be aimed at volume, even by high-performance standards.

It would sit as a brand-defining object for collectors, long-term Porsche loyalists and buyers who want something with a clear engineering story rather than a purely digital performance pitch.

The timing is also notable because Porsche’s sports-car range is moving in two directions at once.

While the S1 is being linked with a combustion engine of unusual character, the next 718 Boxster and Cayman are being developed as electric models.

The electric 718 Boxster has already been seen testing in the United States, underlining how close that side of the transition is becoming.

Details & Specifications

The S1 remains an unconfirmed prospect in practical terms, but the ingredients being discussed are unusually compelling.

A Porsche flagship with a bespoke flat-eight would offer something increasingly rare in the supercar world, a new mechanical character rather than just another escalation of power, weight and software.