Milltek Downpipe for Audi S3 8V2, S3 8V-8V2 / VW Golf Mk7, Golf Mk7.5 - ECE - Large Bore Downpipe + High-Flow 200 CPSI Catalytic

Milltek Sport downpipe with high-flow catalytic converter for Audi S3 8V2 / Volkswagen Golf Mk7 Alltrack - SW

Want a Stage 2 on an Audi S3 8V2 / Volkswagen Golf Mk7 Alltrack - SW without giving up your catalytic converter? This large-diameter Milltek Sport downpipe with high-flow sport catalytic converter pairs a high-flow cat with a freed-up tube for a more responsive turbo.

Technical specifications

• Milltek part number: SSXAU423
• Part type: Downpipe with high-flow catalytic converter
• Detail: ECE homologated, large-diameter downpipe and 200 CPSI high-flow sport catalytic converter
• Tube diameter: 76.2 mm (3 inch)
• Fitting information: Milltek line fitting - Remap ECU
• Material: aerospace-grade stainless steel
• Homologation: ECE / EC homologated
• Manufacturer: Milltek Sport (UK)

Compatible vehicles

• Audi S3 8V2 2.0 TFSI (Quattro, 3-door, 2013-2018, with DPF)
• Audi S3 8V2 2.0 TFSI (Quattro, Saloon - Cabriolet, 2013-2018, without DPF)
• Audi S3 8V-8V2 2.0 TFSI (Quattro, Sportback, 2013-2018, without DPF)
• Volkswagen Golf Mk7 Alltrack - SW 2.0TFSI (4Motion, Wagon, 2016-2021)
• Volkswagen Golf Mk7 R 2.0 TSI 300 hp (76 mm version, 2014-2016)
• Volkswagen Golf Mk7 R 2.0 TSI 300 hp (Wagon, 2015-2017)
• Volkswagen Golf Mk7.5 R 2.0 TSI 310 hp (76 mm version, 2017-2021, without DPF)

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

Most frequently asked questions

• Is an ECU tune required? Yes. A suitable ECU map (Stage 2) is essential to get the full benefit 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 high-flow catalytic converter: it still provides real emissions control while flowing much more than the original. It is the choice of tuners who want to keep their vehicle clean.
• Line compatibility: this downpipe is designed to connect to a Milltek exhaust line. Check the correct version if you keep the original exhaust line.

Why choose Milltek Sport?

Milltek Sport designs and manufactures its exhausts in England, using mandrel-bent tubes to preserve the internal diameter and a fit developed specifically for the vehicle. The result: a clean installation with no modification needed, and a sound tuned to stay pleasant for everyday driving.

Further reading

• Golf 7 and 7.5 R: which Milltek exhaust line to choose?
• Downpipe: decat or high-flow catalytic converter for your Stage 2?
• Exhaust line and contrôle technique in France