The Lamborghini Urus, Audi RSQ8, C8 RS6 and C8 RS7 share the same family of 4.0 litre twin-turbo V8 (listed by Spool as the EA825), so their downpipes are close relatives, but they are not all interchangeable. Some pipes cover the Urus and RSQ8 together, others the RS6 and RS7, and fitment years matter. Your choice is between free-flow (race) pipes, high-flow catted pipes and factory-style catted replacements, and for the Urus there is also a valved cat-back to pair with them.
Below we compare the options, explain what differs between the models, and list the fuel-system upgrades that go with them.
The Shared 4.0T Platform and What Differs
All four cars use a hot-V twin-turbo V8, with the turbos mounted in the valley between the cylinder banks. The engine family is shared, but the cars around it are not: the Urus and RSQ8 are SUVs, the RS6 is a wagon (Avant) and the RS7 a Sportback, and each has its own underbody, exhaust routing and model-year changes. That is why the listings split fitment the way they do:
- Urus and RSQ8 together: IRL MaxFlow Race and Spool downpipes (Spool also lists the Porsche Cayenne Turbo).
- RS6 and RS7 together: IRL MaxFlow, Spool race (also the D5 S8) and STRATEC catless.
- SQ8 and RS Q8: STRATEC high-flow catted with heat shields.
- Urus only: STRATEC free-flow and STRATEC factory catted replacement.
The earlier C7 RS6 4.0T is a different generation with its own STRATEC catted and catless pipes.
Free-Flow vs Catted Replacement vs Race
| Type | What it is | Examples |
|---|---|---|
| Race / free-flow | No converter; most flow and sound | IRL MaxFlow Race, Spool race, STRATEC free-flow (Urus), STRATEC catless (RS6/RS7) |
| 200 or 400-cell | High-flow converter in the pipe | IRL C8 RS6/RS7 MaxFlow (Race, 200 or 400-cell), Spool Urus/RSQ8 200-cell option |
| High-flow catted | Stainless pipe with high-flow converters and heat shields | STRATEC SQ8 / RS Q8 |
| Factory catted replacement | OEM-style geometry with a factory-spec converter | STRATEC Urus factory catted replacement |
The factory catted replacement is a different kind of part. STRATEC describes it as keeping stock exhaust tone, turbo response and refinement, for owners who need a replacement without changing sound or performance.
Catless and high-flow downpipes and other emissions-related parts are intended for off-road and competition use and may not be legal for road use where you live. Check your local laws and inspection rules. Our catless vs catted guide explains the trade-offs in more detail.
Valved Cat-Back Options for the Urus
The STRATEC stainless valved exhaust for the Urus, Urus S and Performante is built for owners who find the factory sound muted. With the valves closed it stays near stock volume; open, it brings a deeper note and more turbo sound. It installs at the factory locations with factory hardware, so you can return to stock. The STRATEC free-flow downpipes are listed as working with the OEM exhaust or an aftermarket cat-back.
Fuel-System Options
Downpipes are often the first step on these cars, and fuel upgrades follow when owners go further or switch to ethanol. Spool sells:
- FX-350 high-pressure fuel pump kits for the Urus, C8 RS6 Avant and RS7. The listings say they flow considerably more than stock and run at 350 bar versus 250 bar on the FX-200.
- A low-pressure fuel system upgrade for the EA825, which replaces the factory pump control module with a Torqbyte PM5 controller while keeping the OEM pump and basket.
- Ethanol analyzer kits for the RSQ8 and Urus, and for the C8 RS6 Avant.
- IFX-EA150 upgraded DI injectors for the EA825.
See our HPFP vs LPFP guide and ethanol analyzer guide for how these parts work together.
Fitment Table by Model and Year
| Part | Listed fitment |
|---|---|
| IRL Urus / RSQ8 MaxFlow Race Downpipes | Urus 2019–2021, RSQ8 2020–2021 |
| IRL C8 RS6 / RS7 MaxFlow Downpipes | C8 RS6, C8 RS7 |
| STRATEC RS6 / RS7 C8 Catless Downpipes | RS6 Avant and RS7 Sportback C8, 2019–2024 |
| STRATEC SQ8 / RS Q8 Catted Downpipes | SQ8 and RS Q8, 2022–2023 |
| STRATEC Urus Free Flow Downpipes | Urus 2018–2022 |
| STRATEC Urus Factory Catted Replacement | Urus 2018–2022 |
| STRATEC Urus Stainless Valved Exhaust | Urus, Urus S, Performante 2018–2024 |
Years come from each listing. If your car falls outside the listed range, check before ordering.
Parts and Tools
- IRL Urus / RSQ8 4.0T MaxFlow Race Downpipes
- IRL C8 RS6 / RS7 4.0T MaxFlow Downpipes — Race, 200 or 400-cell
- Spool Urus, RSQ8 & Cayenne Downpipes — catless or 200-cell
- Spool C8 RS6, RS7 & D5 S8 Race Downpipes
- STRATEC SQ8 / RS Q8 High-Flow Catted Downpipes
- STRATEC Urus Factory Catted Replacement Downpipe
- STRATEC Urus Stainless Valved Exhaust
- Spool Urus FX-350 HPFP Kit
- Spool RSQ8 & Urus Ethanol Analyzer Kit
Shop by car in Lamborghini Urus, Audi RS6 and Audi RS Q8.
Shop: 4.0T V8 Parts — Audi RS6, RS7, RS Q8, Urus.
Install Notes
Hot-V engines put the turbos and the start of the downpipes in a tight, very hot space. Let the car cool completely, use a lift or jack stands, and expect a long job. Several listings describe the gains as coming with proper tuning, so plan a tune for race and high-flow pipes. Professional installation is a sensible choice on these cars.
Frequently Asked Questions
Do Urus downpipes fit the RSQ8?
Some do. The IRL and Spool pipes list both cars. Check the years: the IRL pipes list the Urus 2019–2021 and RSQ8 2020–2021.
Do RS6 downpipes fit the RS7?
The C8 RS6 and C8 RS7 share several downpipe options in stock. The earlier C7 RS6 uses different parts.
Is there a catted option that keeps the factory sound?
Yes. The STRATEC Urus factory catted replacement matches factory geometry with a factory-spec converter.
Do I need a tune?
For race and high-flow pipes, plan on a supporting tune. Factory-style replacements are designed to keep stock behavior.