Milltek Sport Large-Bore Downpipes with HJS 200-Cell High-Flow Cats for Audi RS4 B9 & RS5 B9 2.9 TFSI (76mm/3 Inch) Non-OPF/Non-GPF | SSXAU815 | Stage 2

SSXAU815 Milltek catted front pipes for Audi B9 RS4 and RS5 2.9 biturbo

Take your B9 RS to the next level with Milltek’s 76 mm performance front section, complete with genuine HJS 200 CPSI metal substrate sport catalysts and a heat-resistant black Cerakote finish. Engineered for the 2.9 TFSI V6 twin-turbo, these large diameter turbo outlet pipes reduce restriction, improve gas velocity and unleash a sharper throttle response, stronger mid-range pull and a richer soundtrack when combined with a Milltek cat-back. Ideal Stage 2 hardware for pre-GPF cars.

We have fitted these at MJ Modifications and customer feedback has been fantastic. If you are searching for RS4 B9 sports cat front pipes, RS5 B9 catted downpipe upgrade, Audi B9 RS exhaust front section, or a high-flow catalyst solution for Stage 2 tuning, this is the proven choice.

Why choose this upgrade

• 76 mm 3.00 inch tubing for maximum exhaust mass flow on the 2.9 twin-turbo
• HJS 200 CPSI metal-core sport catalysts for durability, quality and performance
• Black Cerakote coating for thermal management and corrosion resistance
• Perfect partner for ECU calibrations at Stage 2 level
• Deeper, motorsport-inspired tone when paired with a Milltek cat-back
• UK-made, TIG-welded stainless steel with precision jig fabrication

Key features and specs

• Diameter: 76.20 mm 3.00 inch
• Catalyst spec: HJS 200 cell CPSI high-flow metal substrate
• Finish: semi-gloss black Cerakote for heat protection
• Configuration: left and right catted front pipe assemblies with heat wrap
• Intended use: with a matching Milltek Sport cat-back system
• Tuning note: ECU calibration recommended to optimise performance and manage emissions readiness
• Vehicle type: Non-OPF Non-GPF models only pre-GPF

Compatibility

• Audi RS4 B9 2.9 TFSI Avant Non-OPF Non-GPF 2018
• Audi RS5 B9 2.9 TFSI Coupe Non-OPF Non-GPF 2017 to 2018
• Audi RS5 B9 2.9 TFSI Sportback Non-OPF Non-GPF 2019 and later

What you receive

• 1 x left-hand catted front pipe assembly with heat wrap
• 1 x right-hand catted front pipe assembly with heat wrap

Part number

SSXAU815

Fitment check

We will verify compatibility before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout so we can confirm fitment for your chassis.

Professional installation and support

Fitting available at MJ Modifications in Warwickshire. For an installation quote or advice on B9 RS exhaust upgrades, Stage 2 packages and cat-back pairings, email info@mjmodifications.co.uk.

About Milltek

Designed and built in the UK, Milltek delivers precision-engineered performance exhaust components trusted by enthusiasts for sound, quality and results across Audi, VW, Porsche, BMW and more.

Search-friendly terms

Audi B9 RS4 sports cat front section, RS5 B9 catted turbo outlet pipes, 2.9 TFSI high-flow catalyst upgrade, 76 mm front pipes, performance exhaust front section, Stage 2 hardware for Audi RS4 RS5, pre-GPF catted front pipes, UK Milltek dealer, HJS 200 cell CPSI cats.