2026 Porsche 911 GT3 RS

4.0L Flat-6

4.0L Flat-6

A spine-tingling naturally aspirated flat-six that climbs to a 9,000-rpm redline with a hard, race-car wail, delivering its power right at the top where it demands to be wrung out.

This 992-generation 4.0-liter flat-six was developed by Porsche's GT motorsport engineers for racing first and adapted for the road, and is essentially the same unit found in the 911 Cup race car. It is not the older Hans Mezger-designed engine, but its modern successor.

• The very same engine is shared between the 911 GT3, GT3 RS and the mid-engined 718 Cayman GT4 RS, the first time the Cayman got the full GT3 powerplant.
• Fitting it into the Cayman GT4 RS required a redesigned, more compact dry-sump oil tank; the main differences between the cars are just the intake and exhaust.
• The 9,000-rpm redline is extraordinary for a road-car engine of this size, a trait inherited directly from its endurance-racing roots.