Milltek Turbo Downpipe Audi S4 B9 2016-2018, S5 F5 2017-2018 - Downpipe with High-Flow Cat HJS 200 CPSI

Downpipe with high-flow sport catalytic converter by Milltek Sport for Audi S4 B9 / S5 F5

Want a Stage 2 on Audi S4 B9 / S5 F5 without giving up the catalytic converter? This large-bore Milltek Sport downpipe pairs a high-flow sport cat with an open pipe for a more responsive turbo.

Technical specifications

• Milltek part number: SSXAU673
• Part type: Turbo downpipe with sport catalytic converter
• Details: Downpipe and high-flow sport catalytic converter HJS 200 CPSI
• Pipe diameter: 63.5 mm
• Installation information: Fits OEM and Milltek exhaust line
• Material: aerospace-grade stainless steel
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi S4 B9 3.0 Turbo V6 (Without sport differential, Sedan - Wagon, 2016-2018)
• Audi S4 B9 3.0 Turbo V6 (With sport differential and without rear chassis reinforcement bars, Sedan - Wagon, 2016-2018)
• Audi S5 F5 3.0 Turbo V6 (With sport differential and without rear chassis reinforcement bars, Coupe, 2017-2018)
• Audi S5 F5 3.0 V6 T (Without sport differential, Coupe - Convertible, 2017-2018)
• Audi S5 F5 3.0 V6 T (Without sport differential, Sportback, 2017-2018)
• Audi S5 F5 3.0 V6 T (With sport differential and without rear chassis reinforcement bars, Sportback, 2017-2018)

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

Most frequently asked questions

• Is ECU tuning required? Yes. A matching ECU map (Stage 2) is essential to get the full 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.
• 200-cell sport catalytic converter: it keeps real emissions control while flowing far more than the original. It is the choice of tuners who want to keep their vehicle clean.

Why choose Milltek Sport?

A reference among European tuners, Milltek Sport develops each of its systems directly on the vehicle. Mandrel bends, careful welds and aerospace-grade stainless steel make for a line that lasts and sounds right.

Going further

• Turbo downpipe: decat pipe or sport catalytic converter for your Stage 2?