Fi Exhaust Full Exhaust System for 2022+ Porsche 718 Cayman GT4RS/Spyder RS
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Unlock +17 WHP gains and elevate your Porsche 718 GT4 RS driving experience with a dyno-tested (dyno chart), valvetronic exhaust engineered for uncompromising performance and an unmistakable soundtrack.
Our catless exhaust system delivered a real-world increase from 458 WHP to 475 WHP, along with sharper throttle response and a more engaging power band—without triggering a CEL or requiring an ECU tune. For European drivers tuning would be required.
What's behind Fi Valvetronic Technology for 718 GT4 RS?
This high-performance setup combines valvetronic technology with over axle pipes (OAP) / downpipes, giving you precise control over sound and backpressure. With valves closed, exhaust gases are routed through the muffler to maintain a comfortable, refined tone. When fully open, the system unleashes a raw, motorsport-inspired note that makes every drive feel like a track session. Crafted from T304 high-grade stainless steel, each component is precision-engineered for perfect fitment, durability, and maximum flow. Custom-designed muffler internals create the GT4 RS’s signature high-revving character, while over-axle pipes / downpipes remove bottlenecks in the exhaust path to free up power and sound volume.
What does the full exhaust setup consist of?
The complete valvetronic exhaust package features a Valvetronic muffler, over-axle pipes (sometimes called downpipes), and your choice of dual exhaust tips in five different finishes to perfectly match your style.
Currently we don’t offer headers for the 718 Cayman GT4 RS and 718 Spyder RS model.
How do I control the exhaust valves?
The Fi valvetronic exhaust offers full integration with the Porsche Sport Exhaust (PSE) system. Using the factory button on the center console, you can switch between Sport and Comfort modes to open or close the exhaust valves:
•Sport mode: Valves open for a more aggressive sound.
•Comfort mode: Valves remain closed until reaching higher RPMs (typically between 4,000–5,500 RPM).
Fi EXHAUST also offers a standalone valve controller that bypasses the factory PSE system, allowing you to keep the valves fully open at all times. This provides uninterrupted, pure exhaust sound without automatic modulation.
Please note: The Fi remote controller and the factory PSE control are not interchangeable. You will need to choose one method for controlling your valves.
Will this exhaust system trigger a check engine light (CEL)?
A muffler-only replacement will not trigger a CEL on any GT4 RS model, as the factory cats are not being replaced.
For Non-OPF models the over-axle pipes (OAP) also will not trigger a CEL, since only the header-mounted sensors are monitored.
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.
For OPF-equipped models (typically European-spec), over axle pipes are monitored and tuning would be required to precent CEL from being triggered.
What kind of performance gains can I expect? How much horsepower increases?
A dyno test on Norh American Non-OPF model showed real-world gain of +17.2 HP and +6.1 Nm, achieved without tuning and with no CEL. The exhaust setup included a valved muffler and over-axle pipe/downpipe, tested under consistent environmental conditions. The gains reflect real-world improvements without any additional engine tuning.
•Stock Exhaust Dyno Results:
Max Power: 458.35 HP @ 8,150 RPM
Max Torque: 330.34 Nm @ 6,020 RPM
•With Fi EXHAUST Muffler + Over-Axle Pipes/Downpipe Dyno Results:
Max Power: 475.58 HP @ 8,080 RPM
Max Torque: 336.43 Nm @ 5,890 RPM
What is a Non-OPF model?
A Non-OPF model is a vehicle not equipped with an Otto Particulate Filter (OPF / GPF). These filters are typically installed on European-spec cars for emissions compliance. GT4 RS models in Canada, the USA, and select other markets are Non-OPF and have fewer monitored sensors, making them ideal for free-flowing exhaust upgrades without the need for tuning.
How does the sound compare to the stock GT4 RS exhaust?
With valves open, the sound is sharper, louder, and more motorsport-inspired, while still being clean and resonant. Valves closed, the system delivers a refined, quieter experience suitable for daily driving. It's a true dual-character exhaust.
Is this compatible with aftermarket headers or factory components?
Yes. The Fi EXHAUST system features precision-fit flanges and is fully compatible with both OEM and most aftermarket headers if connecting points are developed based on OEM measurements.
Which models is this exhaust compatible with?
The Fi EXHAUST system is compatible with the Porsche 718 Cayman GT4 RS and 718 Spyder RS models. It supports both Non-OPF versions (such as U.S. and Canadian cars) and OPF-equipped European models.
FAQ
At T1 Motorsports, Not only do we specialize in aftermarket parts, but we also specialize in all mechanical repairs. We are a full-service mechanical shop, with skilled technicians geared towards OEM and Aftermarket enthusiasts.
How Long Will It Take to Receive My Order?
Shipping times depend on your location and our inventory levels.
- In-Stock at T1 Motorsports Orders: Orders for in-stock items will be shipped out on the same business day.
- Out-of-Stock & Distant Warehouse Orders: If an item is not in stock or is located in a warehouse, it will take 2-3 weeks to arrive at our facility before being shipped using the method selected at checkout.
- Order Tracking & Confirmation: Delivery details, including tracking information, will be provided in your confirmation email once the order has shipped.
For any shipping-related questions, please contact T1 Motorsports customer support.
My Order Is Taking Longer Than Expected. What Can I Do?
At T1 Motorsports, we strive to ensure every customer is satisfied with their experience.
- Before your order is confirmed, you will receive an email with the estimated arrival time (ETA) for your shipment.
- While we do our best to meet all delivery expectations, unexpected delays may occur. Rest assured, our team is always here to help and resolve any issues.
- If you have any concerns regarding your order, please contact us directly, and we’ll work to find the best solution for you.
What Is Your Order & Shipping Policy?
It is your responsibility to provide accurate shipping information at checkout. T1 Motorsports is not liable for any delays, lost shipments, or additional costs resulting from incorrect or incomplete addresses submitted during ordering.
What Is Your Return & Exchange Policy?
All processed orders that have not shipped will incur a 6% processing fee, this is mainly to cover any payment processing and cancelation fee with the manufacturer or warehouse. A processed order is an order that has already been put in our system and the product has been taken out of inventory and moving towards the packing and shipping face.
On special order or custom-made orders, the processing face is indicated when the manufacturer has received our order. Please be courteous and notify us ASAP if you wish to cancel any order(s) that were recently placed in order to prevent it from shipping out.
Due to the nature of racing and performance vehicles, no returns will be accepted on special order items, opened, installed, incomplete, or otherwise used products. If a product is ordered and not wanted, the UNUSED item can be returned within 30 days after the product has been delivered. This does not apply to SPECIAL ORDER items. Once the product is returned, you have two options for your refund:
You may have your purchase refunded back on your original payment method minus a 20% restocking fee of the total amount. In this case, please know that the initial shipping is not refundable (free shipping items still incur shipping chargers which MUST be deducted on a return). All items wanting to be returned MUST be reported within 30 days of delivery date. If you are still browsing and want an alternate product, we can provide you with a full credit minus shipping costs as a T1 Motorsports store credit. Some brands are excluded and may incur up to a 10% restocking fee. Please contact us to confirm.
On both refund options, a return shipping label may be provided if you are unable to ship the product(s) back using your own method of shipping. This shipping cost will be deducted from your total refund or credit.
What Should I Do If My Ordered Product Doesn't Fit?
We strive on making our fitment guide perfect. If you have any fitment issues regarding your product, please contact us by email or phone and we will solve your issue.
What is Your Order Pickup Policy?
- Once you receive an email confirming that your order is ready for pickup, you may collect it at our store during regular business hours.
- If you wish to designate someone else to pick up your order, please notify us via email with their full name. They will need to provide a valid ID at the time of pickup.
- To expedite the process, please bring your order number when arriving at the store.
- You have 60 days from the date your order status is updated to "Ready for Pickup" to collect your order, unless a different pickup date has been agreed upon.
Orders not picked up within the 60-day window will be deemed abandoned and canceled. No refunds will be issued for abandoned orders.
Armstrong G
Had a great experience purchasing winter tires and rims here. Straightforward communication, promise delivered.
AeroWolf
Picked up my exhaust from T1 Motorsports. Awesome customer service from beginning to end. Every email I sent received a response very quickly and they were very informative and polite. Highly recommend for high-end parts!
Sandra G
Excellent experience with T1 motorsports. They were super responsive, very flexible with their service despite the holiday season and had competitive prices with knowledgeable staff