Mercedes-Benz C400 W205 / S205 V6: the C-Class that raises its voice, the exhaust system guide

The biturbo V6: the well-kept secret of the C400 W205

The C400 W205 gets a direct-injection V6 fed by two turbochargers. It delivers 333 hp and 480 Nm, a thick band of torque that arrives early and gives the sedan the pulling power of a sports car. Discreet in appearance, the C400 hides genuine accelerating ability that nothing, neither its looks nor its factory sound, would lead you to suspect.

The factory exhaust on the C400 follows the C-Class philosophy of comfort: it neutralizes the voice of the V6. In its place, the valved Rog exhaust is controlled on demand, and both the engine and its ECU stay as they left the factory. It gives the biturbo V6 a more present, sportier edge, which you keep for the moments you choose, with the valves open.

How the exhaust on your Mercedes-Benz C400 W205 / S205 V6 is put together

An exhaust system is best understood in two parts. Here is what each one does, and what Rog replaces.

Your Mercedes-Benz C400 W205 / S205 V6 in figures

On a modern car, an exhaust system first changes the voice, the breathing and the weight at the rear. Power, on the other hand, comes from an ECU remap.

Published factory and Stage 2 figures.

Our exhaust systems work perfectly with or without an ECU remap. On your Mercedes-Benz C400 W205 / S205 V6, however, we recommend one at an approved tuning center: it is what lets the engine deliver its full potential.

Boosted by two turbos, the C400's V6 is not used to the full from the factory: a Stage 2 redefines the boost pressure and mapping to tap into this headroom. How far the result goes depends on the car and the tuner. The Rog exhaust then becomes its natural complement on the exhaust side.

Configuring your exhaust, step by step

3 choices, in the same order as the product page configurator.

1. 1

   Step 1 of 3: Material: stainless steel or titanium

   Titanium costs more than stainless steel; the price of each version is shown on the product page, in your currency.

   304 stainless steel

   Weight

   Baseline

   Sound

   Full and rounded

   The benchmark for high-end exhausts: tough, corrosion-proof, with a full, rounded sound. The choice of most of our customers.

   Titanium

   Weight

   Around 40% lighter

   Sound

   Metallic, crystal-clear

   Around 40% lighter than stainless steel for the same design, with a more metallic sound that turns crystal-clear at high revs. Its finish ranges from brushed to blued tints.

   Over time, both hold up: 304 stainless steel stands up to winter salt and damp, and titanium does not rust. Stainless steel or titanium: what really changes.

2. 2

   Step 2 of 3: Front section: downpipe and catalytic converter

   Optional: the downpipe on your Mercedes-Benz C400 W205 / S205 V6, with its catalytic converter. Sound intensity is rated on our scale of 0 to 10, valves open; the factory exhaust scores 3.

   Cat-back only

   Included

   7/10

   Factory emissions control

   The factory catalytic converter stays in place. The starting point and, for many of our customers, more than enough.

   200-cell sports catalytic converter

   8/10

   Road use and inspection

   Emissions control is still very much there, and flow improves noticeably. The choice for everyday driving.

   100-cell sports catalytic converter

   9/10

   Inspection: depends on local rules

   Half as many cells: flow comes close to a decat and the sound gains real aggression at high revs.

   Decat

   10/10

   Track use

   No emissions control: maximum flow, raw sound, the sharpest revving.

   Sound intensity, on a scale of 0 to 10

   1. 10/10Decat downpipe + Rog cat-back
   2. 9/10100-cell sports catalytic converter + Rog cat-back
   3. 8/10200-cell sports catalytic converter + Rog cat-back
   4. 7/10Rog cat-back only, factory catalytic converter retained
   5. 3/10Factory exhaust, for comparison

   Valves open. With the valves closed, every configuration becomes discreet again.

   What about the engine warning light? With a sports cat, it can come on with some engines: the sensor placed after the catalytic converter measures a different level of emissions control from the original. It is not a mechanical failure, but a warning light should never be masked or cleared without dealing with its cause: the right answer is a catalytic converter suited to the engine, with a map by a tuner who takes it into account. The decat version, for track use only, almost always triggers it. If this happens to you, write to us and we will point you in the right direction. Passing vehicle inspection with a sports exhaust.

3. 3

   Step 3 of 3: Valves: Rog remote or factory control

   Two ways to control the valves on your Mercedes-Benz C400 W205 / S205 V6.

   Rog remote

   

   A small control unit fits in the trunk. Two buttons, open and closed: the valves respond at any moment, whatever the drive mode. Simple to fit, and we stay on hand throughout the installation.

   Factory control

   • Only for vehicles fitted with factory valves
   • Controlled by the drive modes

   If your vehicle is fitted with factory valves, the exhaust keeps their existing control. The drive modes decide, just as they did from the factory, with no added electronics.

   On the highway, with the valves closed, the gases pass through the muffler, designed for cruising: no drone at a steady speed. You open up when you feel like it, not when the highway decides for you. More about exhaust drone.

The Rog sound signature on the C400's biturbo V6

The biturbo V6 has a deeper, more robust voice than the C-Class four-cylinders, with an edge that hardens under load. In the standard C400, this voice goes almost unnoticed, to the point that the sedan seems more modest than it really is.

With the valves open, the Rog exhaust reveals the V6: a more assertive start-up, full-bodied acceleration and a presence that underlines every burst of speed. With the valves closed, the C400 regains the restraint of a premium sedan, perfect for everyday driving and long distances.

From order to fitting

1. Configuration

   You choose your exhaust and enter your VIN, found in box E of your registration document or at the base of the windshield.

2. Check

   We check compatibility with your VIN before manufacturing begins.

3. Manufacturing

   Your exhaust is made to order, for your car.

4. Delivery

   Free, insured to your door, tracked from dispatch.

5. Fitting

   No welding or cutting: clamps and gaskets, around two hours on a lift.

20 working days from order confirmation to delivery

Warranty

3 years, parts and workmanship, from the date of purchase

Payment

Card, PayPal or bank transfer

Installation

At the garage of your choice

What about the manufacturer's warranty on your Mercedes-Benz C400 W205 / S205 V6? In Europe, a manufacturer cannot refuse warranty cover simply because a part from another brand has been fitted: it has to prove that the fault comes from that part. Our article on the manufacturer's warranty.

Our recommendations for your Mercedes-Benz C400 W205 / S205 V6

• Daily driving

  • Stainless
  • Cat-back only
  • Rog remote

  Your Mercedes-Benz C400 W205 / S205 V6 stays easy to live with, the factory emissions control is retained, and you open the valves when you decide.

  View this configuration

• Fast road

  • Titanium
  • 200-cell downpipe
  • ECU remap

  More sound, more breathing, and a car you can still present at vehicle inspection.

  View this configuration

• Track

  • Titanium
  • Decat downpipe
  • Stage 2

  The most extreme configuration, for track use only.

  View this configuration

And if you are still unsure, that is perfectly normal: it is exactly why we answer every message.

Mercedes-Benz C400 W205 / S205 V6: your questions

Further reading

• All Mercedes-Benz exhaust systems
• Mercedes-Benz C200 / C300 W205 / S205 / C205 / A205
• Mercedes-AMG C43 W205 / S205 / C205 / A205 3.0 V6 turbo
• Mercedes-AMG C63 / C63 S W205 / S205 4.0 V8 biturbo
• Stage 2: the role of the downpipe
• How to pass vehicle inspection with a modified exhaust
• Pop & Bang: how it works, and is it risky?
• The 28 brands we cover