Valved Exhaust System for Mercedes-Benz CLS350 C257 2.0 turbo (2018-2023)
Configuration
Mercedes-Benz CLS350 C257 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 Mercedes-Benz CLS350 C257 exhaust in detail.
Under the bonnet of the CLS350 C257 is the M264: a 2.0-litre turbocharged four-cylinder with 299 hp and 400 Nm, which focuses on efficiency rather than expression. Acceleration stays crisp despite the size of a large saloon, and the page covers the 2018 to 2023 model years. The six-cylinder CLS450 and the CLS53 AMG have their own pages.
A modern turbocharged four-cylinder has more character than you would suspect: a muffled note at low revs, a sharper grain under acceleration. The factory exhaust erases all that and leaves only a neutral whisper, out of step with the car’s design. With the valves open, the Rog cat-back gives it a deeper, more substantial tone, never intrusive; with the valves closed, the elegant silence returns for business meetings.
The system is built for your VIN, then bolted on in about two hours, clamps and gaskets, no cutting. Factory valve control retained if the CLS has it; failing that, the Rog remote.
The “Manifold” option replaces the M264’s downpipe, identical to the one on the E300 W213 according to specialist manufacturers. The 200-cell version, which keeps emissions control, is the one we recommend on a saloon of this type. A 100-cell downpipe would be accepted or not depending on the car and the rules in your country, and the decat remains reserved for track use, a rare use for a CLS350. No Stage 2 figures are published, and without an ECU remap the effect remains acoustic. Titanium, around 40% lighter, joins 304 stainless steel as a material option.
Mercedes-Benz CLS350 C257 2.0 turbo exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | Mercedes-Benz CLS350 C257, four-door coupé |
| Engine | M264, 2.0-litre turbocharged four-cylinder, 299 hp and 400 Nm |
| 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 |
| 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 Mercedes-Benz CLS350 C257 2.0 turbo exhaust.
Can I fit the CLS350 C257 system to a six-cylinder CLS450?
No, the CLS450 has its own page, as does the CLS53 AMG. This page exclusively concerns the four-cylinder CLS350 C257, 2018 to 2023 model years. The VIN lets us confirm your version before manufacturing.
What would be the point of an ECU remap on a CLS350 C257 fitted with the downpipe?
For the rear system, no: the M264 keeps its ECU and its 299 hp. With the downpipe, it is the ECU remap that converts the flow into power; the page publishes no Stage 2 for this engine.
Vehicle inspection: does a modified CLS350 need any preparation?
Simply close the valves and keep the cat-back alone or a 200-cell downpipe: stock sound, treated exhaust gases. More open, the 100-cell version will be accepted or not depending on the car and the rules in your country. Reserved for track use, the decat version falls outside this framework.
Which material do you recommend for a CLS350 C257?
304 stainless steel for a car driven all year round, with a round sound; titanium if you are after around 40% less mass and a clearer note at high revs, with a colour of your choice.
Mercedes-Benz CLS350 C257 2.0 turbo: 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.
Rog expert guide
Mercedes-Benz CLS350 C257: elegance finds its voice, the exhaust system guide
The CLS350 C257 carries on the idea that made the CLS a success: a saloon with the looks of a coupé, elegant and comfortable. Under the bonnet sits a 2.0-litre turbocharged four-cylinder with 299 hp, which the factory exhaust renders...
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.
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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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