Valved Exhaust System for Mercedes-Benz CLS450 C257 3.0 turbo 4MATIC (2018-2023)
Configuration
Mercedes-Benz CLS450 C257 4MATIC 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 CLS450 C257 exhaust in detail.
The CLS450 C257 pairs a 3.0-litre turbocharged inline-six, 367 hp and 500 Nm, with 4MATIC all-wheel drive. A naturally balanced layout, very linear revving, smooth roll-ons: it is the gentlest version in the range, covered here for the 2018 to 2023 model years in 4MATIC form; any rear-wheel-drive version is not documented.
Its tone is one of the most pleasant there is: silky, seamless, loaded with hoarser harmonics under acceleration. As standard, only an elegant murmur remains. On the road to your holidays, with the valves closed, your CLS keeps the hushed silence of a grand tourer; with the valves open, the Rog cat-back reveals a round sound from start-up and a climb through the revs you can finally hear.
Built to your VIN, the valved system fits without welding, with clamps and gaskets, in about two hours. It takes over the factory valve control if there is one, or comes with the Rog remote. The four-cylinder CLS350, the CLS53 AMG and the E53 W213 have their own page.
On this turbocharged six-cylinder, the “Manifold” option corresponds to the downpipe and its catalytic converter. With 200 cells, the downpipe keeps emissions control, an obvious choice for a grand tourer like the CLS450. For the 100-cell version, acceptance will depend on the car and the rules in your country, and the decat variant is reserved for track use. The page publishes no Stage 2: only an ECU remap would turn this part into power. 304 stainless steel matches the silky character of the six-cylinder; titanium, around 40% lighter, adds metallic harmonics.
Mercedes-Benz CLS450 C257 3.0 turbo 4MATIC exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | Mercedes-Benz CLS450 C257 4MATIC, four-door coupé |
| Engine | 3.0-litre turbocharged inline-six, 367 hp and 500 Nm, 4MATIC drive |
| 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 CLS450 C257 3.0 turbo 4MATIC exhaust.
Is a rear-wheel-drive CLS450 C257 covered?
Our page covers the CLS450 4MATIC from 2018 to 2023; no two-wheel-drive version is listed. The simplest option is still to send us the VIN: the check is done before any manufacturing.
Will an equipped CLS450 C257 need its ECU modified?
Not for the cat-back, which leaves the electronic engine management intact. If you add the downpipe, an ECU remap at an approved tuner turns it into power; no Stage 2 figure is published for this six-cylinder.
Mercedes-Benz CLS450 C257 3.0 turbo 4MATIC with a Rog exhaust: what should you know about vehicle inspection?
Valves closed, with the cat-back alone or a 200-cell downpipe, it keeps the stock noise level and emissions control. The 100-cell, however, will be accepted or not depending on the vehicle and your country’s rules, while the downpipe without a catalytic converter is reserved for track use.
Does the CLS450 C257 stay hushed on long journeys?
Yes: with the valves shut, the silencer does its job and the six-cylinder fades into the background, just as it did on delivery. You only hear it when you want to.
Mercedes-Benz CLS450 C257 3.0 turbo 4MATIC: 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 CLS450 C257: straight-six elegance, the exhaust guide
With the CLS450 C257, Mercedes-Benz carries on the four-door coupé idea that made the CLS's name, pairing it with a 3.0 turbo inline-six and 4MATIC all-wheel drive. The result: an elegant, fast and composed grand tourer. Its factory exhaust, on...
In detail
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Fitment, sound, catalyst, valves, delivery: the answer comes straight away, with your configuration in context.
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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.
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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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