Porsche Unveils $375,500 911 GT4 R to Replace Cayman Clubsport for 2027

Q: How will the powerful 911 Cup-derived racer be tamed for the strictly regulated GT4 class?

It will be reined in mainly through GT4 Balance of Performance rules, with Porsche physically detuning the 911 Cup-derived package to fit the class. Although the 911 GT4 R uses the 911 Cup car’s 4.0-liter flat-six rated at 520 hp, its real race output will be capped by BoP. Porsche says the car is delivered with air restrictors—reported at 53.7 mm—that cut power to roughly 430 PS, or about 424 hp, bringing it into the GT4 performance window. Series organizers can then further balance the car through the usual BoP tools, including weight and power adjustments. The chassis is also adapted away from full Cup-car specification. To meet GT4 rules, the 911 GT4 R runs wheels that are one inch narrower than the 911 Cup’s and uses a five-bolt hub pattern instead of center-lock wheels. Porsche has also built in ballast provisions so teams can meet category-specific minimum weights and BoP targets. Its aero and setup are race-focused but still class-contained. The rear wing has 11 adjustment positions, while the suspension uses dual-adjustable dampers and selectable spring rates, giving teams tuning range without escaping GT4 limits. In other words, Porsche has not simply dropped a Cup car into GT4; it has trimmed engine output, altered hardware, and left final parity to the class’s BoP system.

3 articles · Updated · Jalopnik · Jun 27

Porsche introduced the 911 GT4 R as its new customer race car for the 2027 season, replacing the 718 Cayman GT4 RS Clubsport and marking the first GT4-class Porsche built from the 911.
A 4.0-liter flat-six from the 911 Cup powers the car with 520 hp and 346 lb-ft, though race output will be adjusted under Balance of Performance rules.
The GT4 R uses a six-speed sequential gearbox, mechanical limited-slip differential and wider tracks, while narrower wheels, a five-bolt hub setup and adjustable suspension meet GT4 regulations.
Weight is about 3,340 pounds, with natural-fiber-reinforced plastic used throughout, an 11-position rear wing and a 10.3-inch cockpit display for race settings.
North American entries are expected next year in the IMSA Michelin Pilot Challenge and SRO Pirelli GT4 America, giving customer teams Porsche's new GT4 platform ahead of the 2027 campaign.