Valved Exhaust System for Porsche Cayman GT4 / Boxster Spyder 981 3.8 (2015-2016)
Configuration
Porsche Cayman GT4 / Boxster Spyder 981 3.8 Valved Exhaust System (2015-2016)
Valves
Operated by remote control, factory-paired.
Estimated at 0.50 m from the outlet, 45°, 2,000 rpm with a warm engine. Allow ± 2 dB depending on the engine and measuring point. A 3 dB difference is audible in a direct comparison; 10 dB sounds roughly twice as loud.
Configuration guide
Sound intensity with the valves open, on a scale of 0 to 10.
| Configuration | Intensity |
|---|---|
| Decat manifolds + Rog cat-back | 10/10 |
| 100-cell sports catalytic converter + Rog cat-back | 9/10 |
| 200-cell sports catalytic converter + Rog cat-back | 8/10 |
| Rog cat-back only, factory catalytic converter retained | 7/10 |
| Factory exhaust, for comparison | 3/10 |
The Porsche Cayman GT4 / Boxster Spyder 981 exhaust in detail.
Mid-mounted engine, manual gearbox, chassis developed by the GT department: the 981 Cayman GT4 was welcomed as a gift to purists. Its 3.8-litre naturally aspirated flat-six, with 385 hp and 420 Nm, responds instantly and climbs through the revs with a linearity that makes it such a joy to drive. Our page covers the 2015 and 2016 Cayman GT4 and Boxster Spyder; the GTS models are not included.
Everything in this car is geared towards sensations, except the factory exhaust, which filters the engine as much as it weighs: 16.7 kg according to our page. With the valves open, the Rog cat-back lets the flat-six howl freely at high revs and punctuates every braking zone with present downshifts; with the valves closed, the GT4 heads to the track or crosses a village without drawing every eye.
The page also sells the manifolds, with integrated catalytic converter, under the “Manifold” option. On this non-turbo 3.8-litre, the gain remains modest, 3 to 8%, and requires an ECU remap; the page lists 425 hp and 462 Nm in Stage 2, and the 200-cell manifolds preserve emissions control.
Fitting in about two hours, with clamps and gaskets, without any welding. Factory valves retained if present, otherwise the Rog remote. 304 stainless steel or titanium, the latter around 40% lighter for the same design, a real asset on a driver’s car; it comes in brushed, gold or purple.
Porsche Cayman GT4 / Boxster Spyder 3.8 type 981 exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicles and generation | Porsche Cayman GT4 and Boxster Spyder 3.8, type 981 |
| Engine | 3.8-litre naturally aspirated flat-six, 385 hp and 420 Nm |
| Years | 2015-2016 |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | Factory valve control if the car has it, otherwise the Rog remote |
| Front section (option) | Manifolds with 200-cell or 100-cell catalytic converters, or decat |
| Fitting | Clamps and gaskets, no welding, about 2 hours |
| Manufacturing and delivery | Made to order, 20 working days, free delivery |
| Warranty | 3 years, parts and workmanship |
Questions about the Porsche Cayman GT4 / Boxster Spyder 3.8 type 981 exhaust.
Can a Boxster Spyder 981 take the Cayman GT4’s exhaust?
Yes. The Boxster Spyder 981 takes the same Rog system as the Cayman GT4: same 3.8-litre flat-six, same clamp-and-gasket fitting. The GTS models, with the 3.4-litre engine, are not covered.
Does the GT4,981 benefit from an ECU remap with sport manifolds?
Our page quotes 425 hp and 462 Nm at Stage 2, forty horsepower more than the stock GT4, a consistent gain for a naturally aspirated engine. The cat-back alone works with the factory map.
My Cayman GT4 is used on track: how do I prepare it for the vehicle inspection?
Return to a road configuration: valves closed, factory or 200-cell manifolds, emissions control retained. 100-cell manifolds will be accepted or not depending on the vehicle and your country’s rules, and the decat version is reserved for track use, where the GT4 is in its element.
How long does it take to receive the exhaust for a Cayman GT4,981?
20 working days from order confirmation to delivery: the system is built for your GT4, then shipped free, insured and tracked. Around two hours of fitting is then all it takes.
Porsche Cayman GT4 / Boxster Spyder 3.8 type 981: Does a valved exhaust system drone?
No. With the valves closed, the gases flow through the whole rear silencer and the cabin stays calm at a steady speed. Our Rog exhausts are designed to avoid drone. Learn more: Why our systems stay calm on the motorway.
Porsche Cayman GT4 / Boxster Spyder 3.8 type 981: straight pipe or resonator?
On this model, two characters at the same price: the straight pipe for the raw sound of your engine, unfiltered, or the resonator for a rounder and slightly softer voice. Either way, the exhaust stays fully sporty. Learn more: Exhaust resonator: what does it do? Straight pipe or resonator, which sound to choose.
Rog expert guide
Porsche Cayman GT4 type 981: the purist's choice, the exhaust system guide
The Cayman GT4 type 981 was welcomed as a gift to purists: mid-mounted engine, manual gearbox, a chassis developed by the GT department and a 3.8-litre naturally aspirated flat-six with 385 hp. Everything in this car is geared towards sensation,...
In detail
Rog Advisor
A question about this exhaust?
Fitment, sound, catalyst, valves, delivery: the answer comes straight away, with your configuration in context.
The Rog Advisor is an automated assistant trained on our product pages and answers. For an important decision, write to us: we confirm by e-mail.
Unsure about your configuration? Talk to us before you order. We know your car. Write to us at contact@rogmotorsport.com: we reply in writing, in English, within 24 hours. Email us
Reviews imported from our previous system and translated from French; verified purchases carry the badge.
Rog presentation film: choosing your vehicle, Standard or Equal Length design, stainless steel or titanium, Z-Pipe, controlled valves, titanium and tip finishes, and support from choosing your configuration through to shipping.
THE Rog CRAFT
Our process.
From the first bend to the last check. The same care at every step.
-
Design
Designed for your vehicle.
Geometry matched to your model, carefully studied bends and precise mounting points. Everything starts with accurate design.
-
Manufacture
Crafted with precision.
Tube bending, part fitting and TIG welding: every joint receives the same care.
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Finishing
Material, elevated.
The finish reveals the character of the metal. Stainless steel or titanium, depending on the options available for your vehicle.
-
Assembly
Every part in its place.
Components are assembled and adjusted. On valved systems, the mechanism is fitted, set up and tested.
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Inspection
Check. Then approve.
Geometry, welds, connections and gas flow: the key points are inspected before shipping.
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Shipping
Ready to join you.
Reinforced packaging protects your exhaust in transit. The final step before giving your vehicle a new voice.
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