Milltek HJS ECE Approved Sports Cat Downpipe/Front Pipes SSXAU771 for Audi RS3 8V 2.5 TFSI (2017-2018 Non-OPF/GPF) & TT RS 8S - Catted Turbo Outlet/Catalytic Front Section - Direct Fit to OE or Milltek Cat-Back Exhaust

HJS ECE Sport Cat Front Pipes by Milltek — Part No. SSXAU771

Give your five-cylinder turbo the upgrade it deserves. This HJS ECE-approved catalyst assembly from Milltek transforms response and tone while keeping you road legal, delivering a freer-flowing front section that pairs seamlessly with the standard rear system or a Milltek rear section. Designed specifically for the 2.5 TFSI in RS3 8V pre-OPF and TT RS 8S, it is a direct bolt-on solution that enhances drivability without compromising compliance.

Expect quicker turbo spool, a crisper pedal feel and that iconic 5-cylinder character turned up to just the right level. We have fitted this setup for customers and feedback has been consistently positive on fit, finish, sound quality and refinement on the road.

Why this HJS ECE sport cat front section is a winner

• ECE compliant HJS catalyst for legal performance on public roads
• High-flow design to support remaps and calibration work
• Smooth turbo outlet path to reduce backpressure and heat build-up
• Direct mating to the original rear exhaust or Milltek cat-back
• Precision-built by a leading UK performance exhaust specialist

Fast facts

• Pipe size: 2.50 in (63.55 mm)
• Approval: ECE approved
• Interface: Fits stock rear section and Milltek Sport rear systems
• Part number: SSXAU771
• Brand: Milltek

Vehicle fitment

• Audi TT RS 2.5 TFSI Quattro 8S Mk3 - 2016 onwards
• Audi RS3 Saloon 400 PS 8V MQB - non-OPF non-GPF 2017 to 2018
• Audi RS3 Sportback 400 PS 8V MQB facelift - non-OPF non-GPF 2017 to 2018

What you will notice

• More urgent mid-range pull with improved gas flow
• Enhanced soundtrack with refined cruising manners
• OEM-plus installation with factory-style connections

Installation and support

For professional fitting and advice, book with MJ Modifications in Warwickshire. Request a fitting quote: info@mjmodifications.co.uk.

We are happy to confirm compatibility before dispatch. Add your UK registration or last 7 digits of your VIN at checkout and we will verify the correct application.

Trusted performance from Milltek

Milltek develop and test exhaust components for leading German performance platforms, bringing meticulous engineering, consistent quality and outstanding fitment to every system. This HJS ECE sport cat assembly is a proven upgrade for enthusiasts who want performance gains with everyday usability.

Ready to unlock response, tone and road-legal performance on your 2.5 TFSI? Choose Milltek SSXAU771 and enjoy a premium upgrade that works brilliantly with both standard and performance rear sections.

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