Mercedes AMG GT C190: restoring the M178 V8's thunder, the complete exhaust system guide
RogMotorsport expert guide
The AMG GT C190 is the car AMG designed for itself: a twin-turbo 4.0 V8 in a front-mid-engine layout, a transaxle gearbox on the rear axle, dry-sump lubrication and an aluminium body. A racing car architecture, and a V8 whose voice is part of the product. The factory exhaust holds it back. This guide explains everything you need to know before choosing your configuration: cat-back only or sport catalytic converter, emissions control, engine warning light, stainless steel or titanium, and the valve system.
The M178 twin-turbo 4.0 V8: dry sump, transaxle, hand-built
The M178 in your AMG GT C190 is a twin-turbocharged 4.0-litre V8, and its architecture is that of a pure sports car. The turbos sit inside the V, between the cylinder banks: the gas paths are shorter and the response becomes more immediate. Lubrication is by dry sump, which allows the engine to sit lower in the chassis. The engine sits in a front-mid position, the seven-speed dual-clutch gearbox is moved to the rear as a transaxle, the structure is more than 90% aluminium, and rear-wheel drive does the rest. Like every engine from Affalterbach, it is hand-built according to the "One Man, One Engine" principle.
The C190 family comes as the GT, GT S, GT C and GT R, with different power outputs. The figures in the table below are based on the 2017 facelifted AMG GT, with 476 hp and 630 Nm. Whatever the version, the verdict is the same: the AMG V8 is one of the most expressive engines on the market, and the factory exhaust holds it back too much. The ROG system gives it the room it deserves.
The figures: what the exhaust system really delivers
At ROG, we always look for the best. That is why we always recommend an ECU remap at an approved tuning centre after installation. Our systems fit perfectly with or without, but it is with a full remap that your engine will express all of its potential.
| Factory | ROG system alone | Stage 2 + Remap | |
|---|---|---|---|
| Power | 476 hp | 491 hp (+15 hp) | 631 hp (+155 hp) |
| Torque | 630 Nm | 647 Nm (+17 Nm) | 830 Nm (+200 Nm) |
| System weight | ~26 kg | ~17 kg stainless steel ~13 kg titanium |
— |
Gains from the ROG system alone without a remap. Stage 2 with a full remap.
To be completely transparent: the exhaust alone brings better breathing and sound, while Stage 2 brings the transformation. The AMG V8 is known among tuners for handling power comfortably: with the ROG exhaust and an ECU remap at an approved tuning centre, the figures above stay within the working range of an engine designed with headroom.
A word about the bottom row of the table, the one people look at least and which matters a great deal: weight. The factory exhaust on your AMG GT C190 weighs around 26 kg. In stainless steel, the ROG exhaust comes down to around 17 kg; in titanium, to around 13 kg. That is weight taken off the rear and the underside of the car, exactly where it hurts most.
Cat-back only or sport catalytic converter: building your configuration
Let us start with a point many websites keep quiet about: you do not have to touch the catalytic converter. Our full post-cat exhaust system, the cat-back, is already a major transformation. It houses the entire valve system and removes a large part of the factory silencers. In sound, character and breathing, the gain is immediate, with the best results for the money. It is the ideal starting point and, for many of our customers, it is more than enough.
Changing the catalytic converter is then for those who want to go further: even more flow, even more sound. Here is exactly what each option means for your AMG GT C190.
200-cell sport catalytic converter
Emissions control remains complete. The 200-cell converter keeps full catalytic treatment: the monolith is simply less dense than the factory one, which lets noticeably more flow through with reduced back pressure. It is the configuration that departs least from factory operation, and the one we recommend for a car used every day.
100-cell sport catalytic converter
Half as many cells. Flow comes close to that of a straight pipe and the sound gains real aggression, especially at high revs. Emissions control is still there, but clearly reduced compared with the 200-cell converter. It is a choice geared towards performance and sound, to be made with full knowledge of the facts depending on your use.
Decat
The decat pipe removes all emissions control: maximum flow, raw sound and the sharpest revving. It is the most extreme configuration we offer, and the only one that removes exhaust gas treatment completely. The choice is yours, made with full knowledge of your situation and how you use the car. If in doubt, call us and we will talk it through.
Sound level, on a scale of 0 to 10
To give you a concrete idea, here is how the configurations rank on your AMG GT C190, with the valves open:
And remember: with the valves closed, every one of these configurations becomes discreet again. That is the whole point of the ROG valve system.
What about the engine warning light?
A question we always get, answered with figures. With a sport catalytic converter (100 or 200 cells), an engine warning light appears in around 15% of cases. A warning light is therefore very rare, but the risk is not zero. With a decat, the warning light is more common, as the ECU detects the missing emissions control. Either way, the fix is simple: a diagnostic tool session or an ECU remap will clear it. And if it happens to you, get in touch and we will help you through it.
Stainless steel or titanium: what difference does it make for you?
Stainless steel (304 grade): the benchmark for high-end exhausts. Tough, durable and corrosion-proof, with a full, rounded sound. It offers the best value for money and is the choice of most of our customers.
Titanium: around 40% lighter than stainless steel, with a more metallic sound signature that turns crystal clear at high revs. It is also an aesthetic choice: titanium comes in several shades, from natural titanium to blued, heat-coloured finishes. It is the material of supercars and motorsport. On the AMG GT C190, it brings an exclusive character that stainless steel simply cannot offer, and it removes weight exactly where a rear-wheel-drive car benefits most.
The ROG sound signature on the AMG V8
The AMG V8 has a sound identity recognised worldwide: a deep, rolling thunder punctuated by sharp bangs on the overrun. On a C190, with the engine just ahead of the cabin and the exhaust running under your feet, this sound is not decoration, it is part of the drive. Our exhaust removes what stifles it and restores that signature in full with the valves open. With the valves closed, the GT becomes a grand touring coupé once again.
The valve system: how it works, and why it changes everything
The principle is simple and mechanical. With the valves open, the exhaust gases run straight through: a direct path, no restriction, maximum sound and flow. With the valves closed, the gases are forced through the rear silencer: the volume drops immediately, the car becomes discreet again and the noise level stays within regulatory limits. Two personalities in one exhaust system, and you are the one who decides.
You have two ways to control these valves, whichever you prefer.
OEM valves: the system is supplied with mounting points to refit your original actuators. Your AMG GT C190 keeps all of its factory management: drive modes and automatic opening according to the manufacturer's mapping. Zero added electronics, completely seamless integration.
ROG remote-controlled valve system: new motorised valves, independent of the factory engine management. A small control unit fits in the boot (very simple installation, full guide shipped with the exhaust), and a remote gives you two buttons: open and closed. You decide, at any moment, whatever the drive mode. Discreet in your street at 7h00 in the morning, spectacular on a mountain road at the weekend.
The tips: the visual signature
Final step of the configuration: the exhaust tips. Shapes, diameters and finishes to choose from, so the tailpipes match the style of your AMG GT C190, whether you want them understated or unmistakable. Something specific in mind, a particular finish? Email us a photo or a description and we will work out together what can be done.
ROG semi-bespoke: why we ask for your VIN
Every exhaust system is assembled for your exact specification. That is why, before ordering, you enter your vehicle's exact details (year, model, engine, chassis) along with your 17-character VIN, shown in box E of your vehicle registration certificate. This is not a formality: it is what allows us to guarantee a perfect fit, with no nasty surprises during installation. Installation is plug and play, with no modification to the vehicle.
On lead times, we are transparent: allow around three weeks between your order and dispatch, one week of design and two weeks of manufacturing. This is not something picked off a shelf, it is an exhaust system built for your AMG GT C190.
A French brand, close to its customers
RogMotorsport is a French brand, and we built it around one conviction: with a product like an exhaust system, the support matters as much as the product itself. In practice, this means you can reach us by phone on 07 56 95 95 39 or by email at contact@rogmotorsport.com, before, during and after your order.
Before ordering: torn between stainless steel and titanium, between a 200-cell converter and a cat-back only, or want to know what suits your use best? Call us, we will take the time. Do you have a specific request, particular tips, a special finish, or a question about your exact configuration? Write to us and we will give you a straight answer. After your order: tracking, fitting advice and support if needed. It is that closeness that makes the difference.
Configure my exhaust system for the AMG GT C190 (from €2,655)
In short: our recommendations for the AMG GT C190
Daily driving, open road: cat-back exhaust or 200-cell catalytic converter, ROG remote-controlled valves. A character transformed every day, with the volume under your control from the first mile to the last.
Enthusiast use: titanium, 100-cell catalytic converter and a Stage 2 ECU remap to unlock the full potential.
Ultimate configuration: decat, full Stage 2. The absolute maximum in flow and sound.
And if you are still unsure, that is perfectly normal: it is exactly why we answer the phone.
Frequently asked questions
MERCEDES AMG GT / GT S / GT C / GT R C190 V8 (2014-2021): your questions
What power gain does the ROG exhaust give on a MERCEDES AMG GT / GT S / GT C / GT R C190 V8 (2014-2021)?
The MERCEDES AMG GT / GT S / GT C / GT R C190 V8 produces 476 hp as standard. With the ROG exhaust alone, without an ECU remap, it rises to 491 hp, a gain of +15 hp, and torque goes from 630 Nm to 647 Nm (+17 Nm). With a full Stage 2 ECU remap, the package reaches 631 hp (+155 hp) and 830 Nm (+200 Nm).
How much weight do you save on a MERCEDES AMG GT / GT S / GT C / GT R C190 V8 (2014-2021)?
The factory exhaust on the MERCEDES AMG GT / GT S / GT C / GT R C190 V8 weighs around 26 kg. The ROG stainless steel exhaust weighs around 17 kg, which is 9 kg less. In titanium, it drops to around 13 kg, which is 13 kg less than the factory system.
Do I need an ECU remap after fitting?
It is not compulsory: the ROG exhaust system works with or without an ECU remap. ROG does, however, recommend one at an approved tuning centre, because it is with a full ECU remap that the engine shows its full potential: the difference is 491 hp without, against 631 hp with.
How do the valves work, and is it loud all the time?
No. The valve system controls how the exhaust opens: with the valves closed, the gases flow through the silenced path and the noise level stays within regulatory limits; with the valves open, they take the straight-through path and the exhaust sound comes through in full. You choose at any moment, which means you can use the MERCEDES AMG GT / GT S / GT C / GT R C190 V8 every day without putting up with the volume all the time.
Which configurations are available, and which one should you choose?
The ROG exhaust system is semi-bespoke: you choose the material (stainless steel or titanium), the manifold (no manifold, 200 or 100-cell sport catalytic converter, or decat), valve control (factory actuators or ROG remote-controlled valves) and the tip finish. Every combination changes the sound and the character of the car. The guide above details what each component changes on the MERCEDES AMG GT / GT S / GT C / GT R C190 V8.
How much does a ROG exhaust cost for a MERCEDES AMG GT / GT S / GT C / GT R C190 V8 (2014-2021), and how long does it take?
For the MERCEDES AMG GT / GT S / GT C / GT R C190 V8, prices range from €2,655 to €4,210 depending on the chosen configuration (material, manifold, valves, tips). As every exhaust system is built for your vehicle, allow around three weeks between order and dispatch: one week of design, two weeks of manufacturing.
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