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Not sure which one? Ask us to confirm fitment first →For UK customers, prices include VAT, customs and delivery unless checkout states otherwise. Outside the UK, shipping is shown at checkout and local customs and taxes remain your responsibility.
Some products are made to order, imported or custom built. If timing matters, contact us before ordering and we will confirm the expected delivery timeframe.
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| Specification | Details |
|---|---|
| Brand | Milltek Sport |
| System | Cat-back exhaust |
| Application | Audi RS4 B9 2.9 V6 Turbo Avant, 2019+, factory OPF/GPF-equipped models |
| Main pipe diameter | 70 mm |
| Main pipework material | 304L stainless steel |
| Configuration | See the complete option table |
| E-mark approval | Varies by SKU; see option table |
Let the RS4 sound as special as it feels.
The RS4 can carry the family all week and still make a good road feel like an occasion. This Milltek cat-back brings more of its V6 character into that experience, with a choice of Resonated or Road+ construction and four oval tailpipe finishes. It fits the 2019+ B9 Avant with factory petrol particulate filters, so you can change the soundtrack and rear-end appearance while keeping the GPFs in place.
For an RS4 that covers plenty of motorway miles, we would start with the Resonated version. Its front and centre silencers give you the more restrained option. Road+ removes those two silencers while keeping the valved rear silencers, giving the exhaust a less silenced layout. Both retain the oval RS look; the finish is a choice about appearance.
Each row is one complete system. Select the matching option and part number when ordering.
| Version | SKU | Price | E-mark approval |
|---|---|---|---|
| Resonated / Polished Oval | SSXAU821 | GBP 3,572.34 | Yes |
| Resonated / Cerakote Black Oval | SSXAU822 | GBP 3,698.24 | Yes |
| Resonated / Titanium Oval | SSXAU823 | GBP 3,876.66 | Yes |
| Resonated / Burnt Titanium Oval | SSXAU824 | GBP 3,962.58 | Yes |
| Road+ / Polished Oval | SSXAU825 | GBP 3,120.06 | No |
| Road+ / Cerakote Black Oval | SSXAU826 | GBP 3,245.96 | No |
| Road+ / Titanium Oval | SSXAU827 | GBP 3,424.38 | No |
| Road+ / Burnt Titanium Oval | SSXAU828 | GBP 3,510.30 | No |
Lower connecting pipes, the selected silencer arrangement, left and right valved rear silencers, electronic valve motors, oval trims and the system fitting kit. Resonated versions include front and centre silencers; Road+ versions include front and centre silencer-delete pipes.
Audi RS4 B9 2.9 V6 Turbo Avant, 2019+, factory OPF/GPF-equipped models
This is the GPF-equipped Avant system. The non-GPF RS4 uses a different kit. Allow approximately 2-2.5 hours for fitting, including removal of the original exhaust. A professional installation gives the pipework, tip alignment and hot clearances the attention they need. The system should be checked again after its first heat cycle.
For a non-GPF RS4 B9 Avant, use our non-GPF RS4 system.
Clean the tailpipes regularly once they are cool, so road dirt and deposits do not become a bigger job later. Use a cleaning product suitable for your chosen tailpipe finish.
For UK customers, prices include VAT, customs and delivery unless checkout states otherwise. For customers outside the UK, local customs and taxes remain your responsibility, and shipping is shown at checkout. If a shipping option is not available, email us and we will prepare a tailored quote.
Many of the products we sell are made to order, imported or custom built, so a lead time may apply. If you need a part urgently, contact us before ordering and we will confirm the expected delivery timeframe and process.
We would choose Resonated for frequent cruising. It has front and centre silencers as well as the valved rear silencers. Road+ retains the same rear-silencer type but omits the front and centre silencers.
Yes. This system fits downstream of the factory petrol particulate filters and retains them. It is the exhaust behind the filters that changes.
No remap is required for this cat-back change with the rest of the exhaust in its standard configuration. Different requirements can apply if you also change downpipes or catalysts.
The silencer and pipe configuration determine the sound. Pick the finish for the look you want: changing the decorative tips within the same system layout is an appearance choice.
Milltek covers parts containing valves for 2 years or 80,000 km and electronic products for 2 years. Other qualifying parts in this system have lifetime cover. Cover is for the original purchaser and excludes fitting labour and failures caused by misuse or unauthorised modification. Keep your invoice and contact us if you need help with a claim.
Model year, engine, drivetrain, hardware and existing modifications can all change what fits. Check the applications and supplier notes above, or send us your exact vehicle and setup before ordering.
Send us your vehicle, year, current setup and any fitting date, event, trip or deadline before ordering. We will help check fitment, product choice and timing.
