Audi RS7 4K: giving the 4.0 TFSI V8 its voice back, the complete guide
RogMotorsport expert guide
The RS7 4K is the RS6 in evening dress: 600 hp, a spectacular four-door coupé silhouette, and the same sound paradox, a V8 muzzled by the OPF. The styling calls for a soundtrack: our exhaust system provides it, with discretion permanently on hand thanks to the valves. This guide explains everything you need to know before choosing your configuration: cat-back only or sport catalytic converter, the French MOT, the engine warning light, stainless steel or titanium, and the valve system. By the end, you will know exactly which exhaust system suits the way you drive.
The 4.0 TFSI: Ingolstadt's twin-turbo V8, muted at the factory
The 4.0 TFSI twin-turbo in your RS7 4K is one of the group's masterpieces: hot-vee turbos, colossal torque, and the top-end reach of a true sports car. But between the hot-vee layout, which naturally filters the exhaust, the OPF on recent versions and silencers sized for hushed cruising, this V8 whispers instead of roaring. Restraint makes sense on the motorway, not all the time.
The ROG exhaust removes the restrictions and frees the V8's real pulse: a deep rumble at idle, an authoritative climb through the revs, crackles on the overrun. And with the valves closed, your Audi goes back to being the discreet grand tourer it knows how to be.
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 | 600 hp | 616 hp (+16 hp) | 670 hp (+70 hp) |
| Torque | 800 Nm | 818 Nm (+18 Nm) | 890 Nm (+90 Nm) |
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 4.0 TFSI 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 reliability range of a thoroughly proven engine.
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.
Replacing the catalytic converter is then for those who want the ultimate configuration: even more flow, even more sound. Here is exactly what each option means for your RS7 4K.
200-cell sport catalytic converter
Passes the French MOT. The 200-cell converter cleans the exhaust enough to meet the emissions limits of the French MOT (contrôle technique), while delivering far more flow than the factory catalytic converter. No compromise on legality in France, and a real gain in breathing and sound. It is our recommendation for a car used every day.
100-cell sport catalytic converter
French MOT pass not guaranteed. With half as many cells, flow comes as close as possible to a decat and the sound gains real aggression, especially at high revs. Emissions control is still there but reduced: passing the French MOT (contrôle technique) is not guaranteed.
Decat
The decat pipe removes all emissions control: maximum flow, raw sound and the sharpest revving. It is the most extreme configuration we offer. To be completely transparent: under normal circumstances, a decat does not pass the emissions test of the French MOT (contrôle technique). 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 RS7 4K, 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 blue burnt finishes. It is the material of supercars and motorsport. On a RS7 4K, it brings an exclusive character that stainless steel cannot offer.
The ROG sound signature on the 4.0 TFSI
On a twin-turbo V8, the acoustic work is about removing what masks the engine. Our exhaust removes the restrictions and oversized silencers to free the V8's natural pulse: a deep, low rumble at idle, a full and authoritative climb, and crisp crackles on the overrun with the valves open. With the valves closed, the V8 turns hushed again, perfect for long journeys.
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 instantly and the car becomes discreet again. 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 exhaust system comes with mounts ready to refit your factory actuators. Your RS7 4K keeps all of its factory management: drive modes and automatic opening according to the manufacturer's mapping. No 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. A choice of shapes, diameters and finishes to match the exhaust outlets to the style of your RS7 4K, whether understated or bold. 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.
We are upfront about lead times: allow 7 days to design your exhaust system, then 10 to 15 days for free delivery, so 2 to 3 weeks on average between your order and delivery. Every exhaust system comes with a 3-year warranty.
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 200 cells and cat-back only, or want to know what best suits the way you drive? 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 whenever needed, our after-sales service is extremely responsive. More than 500 exhaust systems fitted and a 4.9-star rating: that is no accident, it is this close relationship that makes the difference.
Configure my exhaust system for the RS7 4K (from €2,655)
In short: our recommendations for the RS7 4K
Daily driving, open road: cat-back exhaust or 200-cell catalytic converter, ROG remote-controlled valves, with looks and sound finally in harmony. No worries at the French MOT.
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
AUDI RS7 4K V8 (2019+): your questions
How much power does the ROG exhaust system add to a AUDI RS7 4K V8 (2019+)?
The AUDI RS7 4K V8 produces 600 hp as standard. With the ROG exhaust alone, without an ECU remap, it rises to 616 hp, a gain of +16 hp, and torque goes from 800 Nm to 818 Nm (+18 Nm). With a full Stage 2 ECU remap, the package reaches 670 hp (+70 hp) and 890 Nm (+90 Nm).
How much weight do you save on a AUDI RS7 4K V8 (2019+)?
The factory exhaust system on the AUDI RS7 4K V8 weighs around 28 kg. The ROG stainless steel exhaust weighs around 18 kg, which is 10 kg less. In titanium, it drops to around 14 kg, which is 14 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 616 hp without, against 670 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, so the AUDI RS7 4K V8 can be used 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 type (200 or 100-cell sport catalytic converter, or decat), the layout (standard, Equal Length or Z Pipe) 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 AUDI RS7 4K V8.
How much does a ROG exhaust system cost for a AUDI RS7 4K V8 (2019+), and how long does it take?
For the AUDI RS7 4K V8, prices range from €2,655 to €4,210 depending on the chosen configuration (material, manifold, geometry, 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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