Valved Exhaust System for Audi S5 B8 Coupé 4.2 V8 (2008-2012)
Configuration
Audi S5 B8 Coupé 4.2 V8 Valved Exhaust System (2008-2012)
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 front pipes + 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 |
AudiA4 / A5 / S4 / S5 / RS4 / RS5 B8 / 8T
The Audi S5 B8 Coupé 4.2 V8 exhaust in detail.
Before moving to the supercharged V6, the S5 B8 Coupé was given a genuine naturally aspirated V8: the 4.2-litre direct-injection 4.2 FSI, with 354 hp and 440 Nm sent to all four wheels through quattro drive. With no turbo, response is instant and power builds with revs. The page covers 2008 to 2012; the S4 and S5 B8 3.0 TFSI have their own system.
This V8 has the deep, round voice of an eight-cylinder, a characteristic growl under acceleration and pick-up that grows in scale without ever saturating. The factory exhaust reduces it to a distant purr. With the valves open, the Rog valved cat-back gives it back its full place: a rumble at start-up, a full and furious climb, a deep burble on the overrun. With the valves closed, the coupé keeps its everyday manners.
The “Manifold” option on the page replaces the front section of the system, which carries the catalytic converter. Chosen with 200 cells, it keeps the emissions control of a coupé that is still often used every day; with 100 cells, it is accepted or not depending on the car and the rules in your country, and the decat version is reserved for track use. On a naturally aspirated V8 like this one, the power gain exists but remains modest, 3 to 8% once the ECU remap is done.
Weld-free fitting, with clamps and gaskets, in about two hours; the tips are round. The valves are controlled through the drive modes if the S5 has them from the factory, otherwise by the Rog remote and its box in the boot. Titanium lightens the system by around 40% compared with 304 stainless steel, in brushed, gold or purple.
Audi S5 B8 Coupé 4.2 V8 exhaust specifications.
| System type | Valved cat-back (valve exhaust), round tips, built to your VIN |
|---|---|
| Vehicle and chassis code | Audi S5 B8 Coupé 4.2 V8 |
| Engine | 4.2 FSI, direct-injection naturally aspirated V8, 354 hp and 440 Nm |
| Years | 2008-2012 |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | Factory valve control if fitted, otherwise the Rog remote |
| Front section (option) | Front section with a 200-cell or 100-cell catalyst, 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 Audi S5 B8 Coupé 4.2 V8 exhaust.
Is my S5 B8 V8 Cabriolet compatible?
The S5 V8 never existed as a convertible: only the coupé received the 4.2 V8. For a 2007 S5, send the VIN before ordering: we check before any manufacturing.
Does the S5 B8’s V8 need an ECU remap to take the system?
Not for the cat-back: the V8 keeps its engine management and its 354 hp. With the front section and a full ECU remap, the published Stage 2 figures are 394 hp and 488 Nm, a measured gain typical of naturally aspirated engines.
How should a modified S5 B8 Coupé be prepared before its vehicle inspection?
Close the valves on arrival: the 4.2 becomes as discreet as a stock coupé. Cat-back alone, or front section with 200 cells: gas treatment remains complete. A 100-cell front section will be judged according to the car and the rules in your country, while the decat version restricts the coupé to the track.
Stainless steel or titanium on the S5’s V8?
304 stainless steel gives a full, round sound, well matched to the V8. Titanium weighs around 40% less for the same design and sounds more metallic at high revs; it comes in brushed, gold or purple.
Audi S5 B8 Coupé 4.2 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 S5 B8 Coupé 4.2 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 S5 B8 Coupé V8: the song of the naturally aspirated 4.2, the exhaust guide
With its naturally aspirated 4.2-litre V8 and quattro drive, the S5 B8 Coupé holds a special place among Audi coupés. Eight cylinders, a crisp throttle response, a surge that stretches out with no flat spots: everything invites you to listen....
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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