Cayman GT4981 tuning
The Cayman GT4 (981) uses a naturally aspirated 3.8 flat-six rated at 380 hp and 310 lb-ft from the factory. Without turbos, gains are smaller: about 11 hp at Stage 1. Most owners tune it for sharper throttle response, a stronger top end and sound.
| Stage | Power | Torque | Gain | % |
|---|---|---|---|---|
| Stock | 380 hp | 310 lb-ft | — | — |
| Stage 1 | 391 hp | 319 lb-ft | +11 hp | +3% |
| Stage 2 | 408 hp | 325 lb-ft | +28 hp | +7% |
| Stage 3 | 432 hp | 335 lb-ft | +52 hp | +14% |
- Stage 1
Software · 391 hp
ECU recalibration of ignition, cam timing and throttle mapping. No hardware changes.
- Stage 2
Software + bolt-ons · 408 hp
Stage 1 plus an emissions-legal intake and cat-back exhaust, with a calibration written for them.
- Stage 3
Intake package · 432 hp
An upgraded intake plenum and further calibration, with the factory catalytic converters kept. Offered only where an emissions-legal kit exists for your car.
Estimates for planning, not measured results. Stock figures are Porsche's factory crank ratings. Your car's numbers come from its own baseline and after-logs.
The 9A1 3.8
engine.
The 981 GT4 uses a 3.8 flat-six adapted from the 991 Carrera S. It is naturally aspirated, so gains are modest. A good tune makes the throttle sharper and the top end feel stronger.
Every Cayman GT4 tune starts with a consult and a baseline log of your car as it sits. We confirm its software version is supported before we quote, and you leave with after-logs and a signed job file. Read our step-by-step tuning guide.
Emissions-legal parts and software only. We keep the factory catalytic converters on every car. If a stage isn't available legally for your exact model and software, we tell you at the consult instead of fitting it.
How much power does a Stage 1 tune add to a Cayman GT4 (981)?
Our Stage 1 estimate for the Cayman GT4 (981) is about +11 hp and +9 lb-ft, taking it from 380 hp to roughly 391 hp. Stage 2 is estimated at 408 hp and Stage 3 at 432 hp. Your car's real result is confirmed with before-and-after logs.
What should be checked on a Cayman GT4 (981) before tuning?
The 981 GT4 uses a 3.8 flat-six adapted from the 991 Carrera S. It is naturally aspirated, so gains are modest. A good tune makes the throttle sharper and the top end feel stronger.
Is a Cayman GT4 (981) tune emissions-legal?
At Redline Exotics, yes. We use emissions-legal parts and software only and keep the factory catalytic converters. If a stage is not available legally for your Cayman GT4's software version, we tell you before quoting.
Request a tuning consult
Usually answered the same day.