Turbo Downpipe Milltek Audi RS4 B9 2019-2025, RS5 B9 2019-2025 - with HJS Highflow 200 CPSI high-flow catalytic converters + DPF

Milltek Sport downpipe with high-flow catalytic converter for Audi RS4 B9 / RS5 B9

Looking for a Stage 2 on the Audi RS4 B9 / RS5 B9 without giving up the catalytic converter? This large diameter Milltek Sport downpipe with high-flow catalytic converter combines a high-flow sport cat with an opened-up tube for a more responsive turbo.

Technical specifications

• Milltek part number: SSXAU819
• Part type: Downpipe with high-flow catalytic converter
• Details: Large diameter downpipe with HJS Highflow 200 CPSI catalytic converters + DPF bypass
• Tube diameter: 70 mm (2.75 in)
• Fitting information: With heat shields
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi RS4 B9 2.9 V6 T (Avant, 2019-2025, with DPF)
• Audi RS5 B9 2.9 V6 T (Coupe, 2019-2025, with DPF)
• Audi RS5 B9 2.9 V6 T (Sportback, 2019-2025, with DPF)

Not sure about compatibility with your vehicle? Contact us with your VIN before ordering.

Our most frequently asked questions

• Is an ECU tune required? Yes. A suitable Stage 2 map is essential to make use of the gain and avoid a check engine light linked to the lambda sensors. It is the question buyers ask most often, and the answer is always the same.
• High-flow sport catalytic converter (200 cells): it keeps genuine emissions control while flowing considerably more than the original unit. It is the choice of tuners who want to keep their vehicle clean.

Why choose Milltek Sport?

Customer feedback most often points to fit quality and a deep tone, present but never harsh. This is the signature of Milltek Sport, a British manufacturer specializing in stainless steel exhausts.

Further reading

• Downpipe: decat or high-flow catalytic converter for your Stage 2?