Porsche 718 GT4 RS Fi EXHAUST Dyno-Proven Gains – No ECU Tuning Required
Here’s what makes the Fi EXHAUST system stand apart: real-world wheel horsepower increases without the need for ECU tuning.
We love working on Porsche sport models, and RS variants always hold a special place for our development team. One question guides everything we do: How can we deliver noticeable, repeatable, real-world results for our drivers?
Dyno-Tested Performance You Can Trust
We wanted to see exactly how our catless exhaust setup would perform compared to the factory system. To find out, we replaced the restrictive stock components and put a 718 GT4 RS on a Dynojet dyno for testing. The results were significant: a gain of +17.2 WHP and +6.1 Nm of torque, all achieved without any ECU tuning. The tests were done on a North American Non-OPF model.
Stock Output:
458.35 WHP @ 8,150 RPM
330.34 Nm torque @ 6,020 RPM
After Fi EXHAUST Upgrade:
475.58 WHP @ 8,080 RPM
336.43 Nm torque @ 5,890 RPM
The setup we tested to achieve these performance gains included a valvetronic muffler and over-axle pipes. At Fi EXHAUST, we sometimes refer to over-axle pipes as downpipes, so you may see both terms used interchangeably.
Why No Tuning Is Required
Because on over axle pipes on Non-OPF GT4 RS are unmonitored, their replacement won’t trigger a CEL. Only header-mounted O2 sensors are critical for emissions monitoring.
Our recommendation for Non-OPF vehicles: Pair the Fi EXHAUST over-axle pipes and valved muffler to achieve the most invigorating sound profile without requiring tuning or risking any CEL. This setup has been tested in real world conditions with zero issues. The result: no CEL, no warning lights, no ECU flash needed.
For OPF-equipped models (typically European-spec), over axle pipes are monitored and tuning would be required to prevent CEL from being triggered.
True Dual Character Sound
The Fi valvetronic exhaust gives you full control of your GT4 RS’s tone:
- Valves Closed: Subdued, refined sound for city driving.
- Valves Open: Raw, motorsport-inspired note that makes the flat-six sing all the way to redline.
Immediate Benefits After Installation
With no tuning required, installation is straightforward. As soon as the system is installed:
- You gain up to +17 WHP immediately.
- You unlock a richer, more aggressive exhaust note with valves open.
- You retain factory PSE exhaust valve functionality as Fi EXHAUST fully integrates with factory settings.
Where can I find more information?
Please visit our product page for the Porsche 718 Cayman GT4 RS / Spyder RS.
Where can I purchase it?
Full performance exhaust setup can be purchased on our shop following this link.
