Valved Exhaust System for Ford Fiesta ST MK8 (2018-2023)
Configuration
Ford Fiesta ST MK8 Valved Exhaust System (2018-2023)
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 downpipe + 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 Ford Fiesta ST MK8 exhaust in detail.
With the MK8 generation, from 2018 to 2023, the Fiesta ST moved to 200 hp and 290 Nm, then 320 Nm from the 2022 facelift, still powered by a turbocharged EcoBoost engine known for its instant response. Ford made it one of the most popular small hot hatches in its class, but its factory exhaust is tuned for regulations far more than for enjoyment.
With the valves open, the Rog valved cat-back gives it an assertive sporty tone, an audible turbo under load and crackles on the overrun; once the valves are closed again, the ST MK8 becomes a discreet city car again. For an MK7, refer to the other Fiesta ST page, as the parts differ; in every case, your VIN is checked before the system is built.
The system is fitted without welding, using clamps and gaskets, in about two hours, and the valves stay controlled by the factory control if the car has one, otherwise by the two-button Rog remote.
The “Manifold” option sells the MK8’s downpipe, which carries the catalytic converter. As long as the MK8’s map stays stock, this part only adds sound and a little lightness; remapped, the ST draws power from it depending on the tune chosen. For a 200 hp supermini driven every day, the 200-cell version keeps emissions control, the 100-cell will be accepted or not depending on the car and the rules in your country, and the decat remains reserved for track use. 304 stainless steel or titanium, around 40% lighter, complete the choice.
Ford Fiesta ST MK8 exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | Ford Fiesta ST, MK8 generation, three-door and five-door |
| Engine | EcoBoost, turbocharged gasoline engine, 200 hp and 290 Nm (320 Nm since the 2022 facelift) |
| Years | 2018-2023 |
| 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) | Downpipe with 200-cell or 100-cell catalytic converter, or decat (“Manifold” option on this page) |
| 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 Ford Fiesta ST MK8 exhaust.
Do the Fiesta ST MK8 parts fit a standard MK7 ST?
No, the 2013 to 2017 MK7 has separate parts and a separate page; this one covers the 2018 to 2023 MK8, with a VIN check before manufacturing.
Is an ECU remap needed to enjoy the system on a Fiesta ST MK8?
For the sound, none: the cat-back gets along with the factory ECU; for power, it is the downpipe combined with an ECU remap at an approved tuner that makes the difference, depending on the tuning.
Fiesta ST MK8 with a Rog system: what should I do before the vehicle inspection?
Close the valves and keep the original or 200-cell downpipe, for active emissions control and a stock voice. An ST MK8 with a 100-cell will depend on your country’s assessment, and a decat ST never leaves the track.
For everyday city use, does the Fiesta ST MK8 with a Rog system stay discreet?
Yes: with the valves closed, it keeps its original discretion in town and on the highway. You open them for a road that suits, at the press of a button.
Fiesta ST MK8 three-door or five-door: is the system the same?
Yes. The three-door and the five-door take the same Rog system: same chassis, same 1.5 EcoBoost, same clamp-and-gasket fitting. Your VIN is only used to confirm the version and model year before manufacturing.
Ford Fiesta ST MK8: Does a valved exhaust system drone?
No. With the valves closed, the gases flow through the whole rear muffler 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 highway.
Rog expert guide
Ford Fiesta ST MK8: unleashing the EcoBoost, the complete exhaust system guide
The Fiesta ST MK8 is the universally loved pocket rocket: the most endearing 1.5 3-cylinder on the market and a go-kart chassis. Its naturally raspy three-cylinder tone is muffled from the factory: setting it free is a treat. Here you...
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
Your country
Rog in the US.
State inspections and your exhaust
A Rog cat-back leaves your factory catalytic converters, oxygen sensors and OBD untouched, and valves closed, your car sounds very close to stock at inspection. Sport cats follow your state's rules, the catless version is for the track only, and your state decides.
On the road
Valves closed around town, your car sounds very close to stock, and you open them whenever you choose.
Your documents
Each system is built from your VIN, and we send its technical documentation free on request, for your state's inspection or for your insurer.
Your insurance
Some insurers ask you to declare aftermarket parts, so let yours know: our free technical documentation makes it easy.
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.
-
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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