Valved Exhaust System for Mercedes-AMG CLS53 C257 3.0 M256 4MATIC+ (2019-2023)
Configuration
Mercedes-AMG CLS53 C257 Valved Exhaust System (2019-2023)
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 CLS53 C257 exhaust in detail.
The CLS53 C257’s M256 is a 3.0-litre inline-six whose turbo is assisted by an electric compressor, tasked with eliminating response time at low revs. Its 435 hp and 520 Nm go to all four wheels through the 4MATIC+ drive, with immediate, steady thrust, on CLS53s produced between 2019 and 2023.
Its voice is clearer and silkier than a V8’s, with a linear climb and a metallic tone reminiscent of the great six-cylinders of the past. The factory system keeps it in the background, true to its grand touring calling. The Rog valved cat-back sets it free: a broad, crisp sound with every acceleration and every downshift, then a return to discretion, valves closed, for an understated arrival.
Fitting requires neither welding nor cutting: about two hours, clamps and gaskets, on a system built to your VIN. The AMG modes control the factory valves if the car has them; otherwise, the Rog remote. The CLS450 and CLS350 of the same generation, like the CLE53 C236, have their own pages.
The “Manifold” option covers the M256’s catalysed downpipe; our sources do not specify model years for this part, so we check it by VIN. The 200-cell leaves emissions control in place and is enough for grand touring. To go further, the 100-cell will be accepted or not depending on the car and the rules in your country, and the decat version is reserved for track use, away from any open road. The page gives no Stage 2 figure for this engine. Titanium saves around 40% of the mass compared with 304 stainless steel and gives a more metallic note.
Mercedes-AMG CLS53 C257 3.0 M256 4MATIC+ exhaust specifications.
| System type | Valved cat-back (valve exhaust), built to your VIN |
|---|---|
| Vehicle and chassis code | Mercedes-AMG CLS53 C257 4MATIC+, four-door coupé |
| Engine | M256, 3.0-litre turbocharged inline-six with electric compressor, 435 hp and 520 Nm |
| Years | 2019-2023 |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | Factory AMG modes or 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-AMG CLS53 C257 3.0 M256 4MATIC+ exhaust.
Can the AMG system from the CLS53 C257 be fitted to a CLS450, which also has a six-cylinder?
No, the CLS450 has its own page despite an engine with the same layout. Only the 2019 to 2023 CLS53 C257 3.0 M256 4MATIC+ is covered here. For a 2018 model or one later than 2023, send the VIN and we check before manufacturing.
Does an equipped CLS53 C257 need to see a tuner for an ECU remap?
None with the rear system alone. With the downpipe, the map is what turns flow into power; the page does not publish a Stage 2 figure for this M256, so the result will depend on the tuner.
Mercedes-AMG CLS53 C257 3.0 M256 4MATIC+ with a Rog exhaust: what should you know about vehicle inspection?
With the cat-back only or the 200-cell sports catalytic converter, emissions control is retained: present the car with the valves closed. The 100-cell brings more sound and flow, and whether it is accepted at the emissions test depends on the car and local rules; the decat version is intended for track use.
Titanium or stainless steel for a CLS53 C257?
Titanium saves around 40% of the weight for the same design and accentuates the inline-six’s metallic tone. 304 stainless steel, rounder in sound, remains the most popular choice for grand touring use.
Mercedes-AMG CLS53 C257 3.0 M256 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-AMG CLS53 C257: the return of the straight-six, the exhaust system guide
A four-door coupé with flowing lines, the CLS53 C257 benefits from Mercedes' return to a layout the brand had long set aside: the straight-six. Its 3.0-litre boosted M256 produces 435 hp and 520 Nm, sent to all four wheels by...
In detail
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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.
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Manufacture
Crafted with precision.
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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.
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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
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