Valved Exhaust System for Mercedes-AMG CLA45 S C118 / X118 2.0 turbo (2020-2023)
Configuration
Mercedes-AMG CLA45 S C118 / X118 Valved Exhaust System (2020-2023)
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 Mercedes-AMG CLA45 S C118 / X118 exhaust in detail.
More than 200 hp per litre: that is the density of the M139 powering the CLA45 S C118, 421 hp and 500 Nm drawn from two litres and a single turbo, hand-assembled in Affalterbach like the brand’s V8s. The page covers cars produced from 2020 to 2023; the CLA45 without the S is not documented here, and the earlier CLA45 C117 with the M133 engine has its own page.
The particulate filter and factory silencers erase the character of this racing engine. Open the valves of the Rog cat-back and the M139 regains its aggression: a sharp, full sound, climbs through the revs that crack, bangs when you lift off. Close them and the four-door coupé becomes perfectly civilised again, with a sound close to stock. All the fun lies in that contrast.
The system, produced for your VIN, replaces the factory one without welding: clamps, gaskets, about two hours on a lift. The AMG modes control the valves if the car has them from the factory; otherwise, the Rog remote decides, whatever the selector position.
On the M139, the most restrictive part after the silencer is the downpipe, sold here under the “Manifold” option. It comes with 200 cells, which keep emissions control, with 100 cells, accepted or not depending on the car and the rules in your country, and in a decat version, reserved for track use. It only brings horsepower with an ECU remap. 304 stainless steel or titanium, which weighs around 40% less and comes in brushed, gold or purple.
Mercedes-AMG CLA45 S C118 / X118 2.0 turbo exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicles and chassis codes | Mercedes-AMG CLA45 S C118 four-door coupé and X118 Shooting Brake |
| Engine | M139, 2.0-litre turbocharged four-cylinder, 421 hp and 500 Nm |
| Years | 2020-2023 |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | AMG drive modes or Rog remote |
| Front section (option) | Downpipe with 200-cell or 100-cell catalytic converter, or decat |
| Fitting | Clamps and gaskets, no welding, about 2 hours on a lift |
| Manufacturing and delivery | Made to order, 20 working days, free delivery |
| Warranty | 3 years, parts and workmanship |
Questions about the Mercedes-AMG CLA45 S C118 / X118 2.0 turbo exhaust.
Can a non-S CLA45 C118 take this exhaust?
Our page only documents the CLA45 S C118 2.0 turbo from 2020 to 2023. For another version, send us your VIN: we check before any manufacturing. The CLA45 C117 and the A45 S W177 have their own page.
How far does a remapped CLA45 S go?
With the downpipe fitted and the ECU remapped, our data shows 490 hp and 600 Nm against the stock 421 hp and 500 Nm. The cat-back on its own needs no work at all: the AMG ECU handles it as it is.
Vehicle inspection: which configuration for a CLA45 S C118?
The most sensible: valves closed, cat-back only or 200-cell downpipe, for an active catalytic converter and a sound close to stock. Beyond that, the 100-cell depends on the car and your country’s regulations; the decat variant belongs on the track.
Does the CLA45 S Shooting Brake X118 take the same system?
Yes. The C118 four-door coupé and the X118 Shooting Brake take the same Rog system: same chassis, same engine, same clamp-and-gasket fitting. Your VIN is only used to confirm the version and model year before manufacturing.
On the motorway, does the CLA45 S drone?
With the valves closed, the flow passes through the silencer and cruising at a steady speed stays calm, with no resonance. The valves open when you decide, through the AMG modes or the Rog remote.
Mercedes-AMG CLA45 S C118 / X118 2.0 turbo: 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
Mercedes CLA 45 S AMG C118 / X118: the snarl of the AMG 2.0, the complete exhaust system guide
The CLA 45 S packs the world's most powerful four-cylinder engine into a compact four-door coupé body: 421 hp, a sharp chassis and the temperament of a race car. The OPF has taken away the voice that should go with...
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.
-
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.
-
Inspection
Check. Then approve.
Geometry, welds, connections and gas flow: the key points are inspected before shipping.
-
Shipping
Ready to join you.
Reinforced packaging protects your exhaust in transit. The final step before giving your vehicle a new voice.
Customer builds
Your videos & photos
The Rog lines fitted on our customers' vehicles, in real conditions.
- Builds
- 500+
- Brands
- 28
- Satisfaction
- 4,9
The journal
News & advice
Best valved exhaust for the Mercedes-AMG A45 / A45 S W177
Which valved exhaust for a Mercedes-AMG A45 or A45 S W177? The options compared (sound, material, valves) and the Rog...
Read the articleBest valved exhaust for the Audi RS3 8Y
Which valved exhaust for an Audi RS3 8Y? The options compared (sound, material, valves) and the Rog system made to...
Read the articleBest valved exhaust for the BMW M2 G87
Which valved exhaust for a BMW M2 G87? The options compared (sound, material, valves) and the Rog system made to...
Read the articleExhaust rules: what changes in 2026 and 2027 (Euro 7, noise cameras, MOT)
Euro 7, new-car noise, noise cameras, MOT and vehicle inspection, and models: what really changes in 2026 and 2027 for...
Read the articleChanging your exhaust: what inspections and approvals cost in 9 countries
What the periodic inspection and the check of a modification cost after changing your exhaust, in 9 European countries: official...
Read the articleIs a cat-back exhaust legal in Ireland? What the NCT checks.
A cat-back leaves your factory cat, sensors and OBD as they are; valves closed, very close to stock, valves open,...
Read the articleSports exhaust (sportsummuti) in Estonia: what the tehnoülevaatus checks.
The sound you choose, a discreet car when it matters: what a Rog valved exhaust gives you in Estonia, how...
Read the articleSports exhaust in Latvia: tehniskā apskate and the CSDD noise limit.
The sound you choose, a discreet car when it matters: what a Rog valved exhaust gives you in Latvia, how...
Read the articleNo article matches this search.
All articles