Quick answer
AZ Motorsport’s Audi RS5 downpipes are listed for the B9/B9.5 RS5 platform: 2018–2025 Audi RS5 B9 Coupe and 2019–2025 Audi RS5 B9 Sportback.
If you searched for “Audi RS5 catless downpipes,” the main fitment check is not just the engine. Start with body style, model year and the live AZM product listing. AZM offers the RS5 downpipe product with Race (Catless) and High Flow (Catted) choices, and the product is positioned for closed-course / off-road race use only.
RS5 B9/B9.5 fitment at a glance
| Your RS5 | AZM-listed fitment |
|---|---|
| RS5 Coupe | 2018–2025 Audi RS5 B9 Coupe |
| RS5 Sportback | 2019–2025 Audi RS5 B9 Sportback |
AZM tags the product for B9 and B9.5 chassis coverage and model years 2018 through 2025. Before ordering, verify the live product page for your exact car because fitment, variants and availability can change.
Primary product to check: AZM Audi RS5 (B9/B9.5) Downpipes.
Catless vs high-flow catted: choose by build plan, not just sound
A catless RS5 downpipe is the most direct race-style flow path. A high-flow catted option keeps a catalyst in the downpipe assembly, but it should not be treated as a universal “no check-engine-light” or road-legal guarantee. For a broader comparison, see our catted vs catless downpipes guide.
Community buyers ask the same practical questions again and again: Will catless downpipes trigger a CEL? Will a high-flow catted downpipe avoid it? Do I need software? The honest answer is that downpipes, rear oxygen-sensor readiness and calibration strategy have to be considered together. Do not buy a downpipe assuming the tune question will solve itself later.
If the car is stock and you are planning the downpipe first, speak with AZ Motorsport or your tuner about your exact vehicle, variant and use case before installing.
What the AZM RS5 downpipes are built to change
AZM describes the RS5 downpipes as a direct bolt-on replacement for the factory downpipes using OEM mounting points. The product page lists 304 stainless steel construction, TIG welding, CNC-machined flanges / cast inlets, no cutting or welding required, and compatibility with factory and most aftermarket exhaust systems where applicable.
The goal is lower backpressure, better exhaust flow and stronger turbo response, especially when the car is paired with the right calibration. This article does not claim a specific horsepower number because the research brief did not find an AZM-sourced dyno figure for this exact RS5 product.
Sound, drone and resonator-delete questions
A downpipe changes sound near the turbo side of the exhaust. A resonator delete changes the centre/rear tone control. Combining catless downpipes with a resonator delete can make the car much more aggressive, but it can also raise drone and rasp concerns depending on the rest of the exhaust.
If your goal is a controlled daily-driver sound, change one section at a time: downpipes, resonators, then rear exhaust. If your goal is a louder race setup, consider the full system as a package and include valve behaviour in the decision. AZM also offers an Audi RS5 B9 Race Exhaust System for buyers planning beyond the downpipes.
Canada / Québec buyer notes
AZM’s product notice states that these downpipes are for closed-course competition and off-road racing vehicles only, and are not legal for use on public roads or emissions-regulated vehicles in Canada or the United States. That point matters for Québec and Canadian buyers: do not treat “catless” as a street-use part, and do not treat “catted” as automatic legal approval.
The Québec angle is practical too. A Canadian buyer comparing an imported listing should compare the landed price, exchange rate, brokerage/customs exposure, support access and installation path, not only the product price shown on a foreign site.
Before you order: five checks
- Confirm your RS5 is a B9/B9.5 Coupe or Sportback within AZM’s listed year range.
- Choose Race (Catless) or High Flow (Catted) based on your build, tuning plan and where the car will be used.
- Ask about CEL/readiness expectations before installation, especially if the car is still on stock software.
- Decide whether you are changing only downpipes or pairing them with resonator/rear-exhaust changes.
- Re-check the live product page and contact AZ Motorsport if your model year, market spec or emissions equipment is unclear.
