Valved Exhaust System for Audi S8 D4 4.0 TFSI V8 (2013-2018)
Configuration
Audi S8 D4 4.0 TFSI V8 Valved Exhaust System (2013-2018)
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 Audi S8 D4 exhaust in detail.
With the S8 D4, Audi replaced the previous generation’s naturally aspirated V10 with the 4.0 TFSI, a twin-turbo V8 with the turbos housed in the vee, rated at 520 hp and 650 Nm, on S8s built between 2013 and 2018. The 605 hp S8 plus is not covered, nor are 2012 cars: your VIN settles it before manufacturing.
From the factory, everything contributes to discretion: turbos in the centre of the engine, silencers sized for cruising, limousine-grade insulation. The V8 whispers. With the valves open, our valved cat-back removes the restrictions and releases a deep rumble at idle, an authoritative climb and crisp crackles on the overrun. With the valves closed, the S8 regains the silence of an executive saloon, one you drive or are driven in.
Four round exits, fitting with clamps and gaskets without any welding, about two hours on a lift: the job remains light. The factory valves stay controlled by the drive modes; failing that, the Rog remote, hidden in the boot, opens and closes them.
The “Manifold” option sold on this page corresponds to the V8’s downpipes, which leave the turbos and house the catalytic converters. An executive limousine hardly ever goes on track: its downpipes are therefore taken with 200 cells, which maintain emissions control; the 100-cell is accepted or not depending on the car and the rules in your country, and the decat version is reserved for track use, a rare use for such a car. Without an ECU remap, the 520 hp remain unchanged, with only the sound and a little weight changing. For the finish, titanium, around 40% lighter than 304 stainless steel, ranges from brushed to purple by way of gold.
Audi S8 D4 4.0 TFSI V8 exhaust specifications.
| System type | Valved cat-back (valve exhaust), four round tailpipes |
|---|---|
| Vehicle and chassis code | Audi S8 D4 4.0 TFSI V8 (S8 plus not covered) |
| Engine | 4.0 TFSI, twin-turbo V8, 520 hp and 650 Nm |
| Years | 2013-2018 |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | Factory drive modes or the Rog remote |
| Front section (option) | Downpipes with 200-cell or 100-cell catalytic converters, or decat |
| Fitting | Clamps and gaskets, no welding, about 2 hours on a lift |
| Manufacturing and delivery | Made to order, 20 working days, free delivery |
| Warranty | 3 years, parts and workmanship |
Questions about the Audi S8 D4 4.0 TFSI V8 exhaust.
Can the S8 plus with 605 hp take the S8 D4 system?
It is not listed: the page targets the 520 hp S8 D4, from 2013 to 2018. If you drive an S8 plus, write to us with the VIN and we look at what is possible before any order.
What does an ECU remap change on the S8 D4’s 520 hp V8?
The cat-back on its own imposes no ECU remap. It is the combination of downpipes and a suitable map that changes the figures: the page lists 693 hp and 840 Nm for the 520 hp version.
Valved S8 D4: in what trim should it be driven to the vehicle inspection?
Closing the valves is all it takes for the V8 to regain its limousine reserve. As long as it keeps the cat-back alone or 200-cell downpipes, its emissions control stays complete. The 100-cell depends on the car and the rules in your country; without a catalytic converter, the S8 belongs on the track only.
How many days before my S8 D4 is on the road with its new system?
Each S8 D4 system is built to the VIN: allow 20 working days from confirmation to delivery, with free delivery, then about two hours of fitting in a workshop equipped with a lift.
Audi S8 D4 4.0 TFSI V8: 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.
Audi S8 D4 4.0 TFSI V8: straight pipe or resonator?
On this model, two characters at the same price: the straight pipe for the raw sound of your engine, unfiltered, or the resonator for a rounder and slightly softer voice. Either way, the exhaust stays fully sporty. Learn more: Exhaust resonator: what does it do? Straight pipe or resonator, which sound to choose.
Rog expert guide
Audi S8 D4: giving the 4.0 TFSI V8 its voice back, the complete guide
The S8 D4 and its 520 hp are one of the most undervalued used buys on the market: the pre-OPF 4.0 TFSI in a limousine now priced at a quarter of its new cost. Here the V8 is completely inaudible...
In detail
Rog Advisor
A question about this exhaust?
Fitment, sound, catalyst, valves, delivery: the answer comes straight away, with your configuration in context.
The Rog Advisor is an automated assistant trained on our product pages and answers. For an important decision, write to us: we confirm by e-mail.
Unsure about your configuration? Talk to us before you order. We know your car. Write to us at contact@rogmotorsport.com: we reply in writing, in English, within 24 hours. Email us
Reviews imported from our previous system and translated from French; verified purchases carry the badge.
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.
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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
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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