Audi RS3 / RSQ3 / TTRS 2.5 TFSI Milltek Sport Downpipe

Unlock the performance potential of your Audi 2.5 TFSI five-cylinder engine with the Milltek Sport Large Bore Downpipe — a premium stainless steel exhaust upgrade designed to improve exhaust flow, turbocharger efficiency and sound.

Developed for OPF/GPF-equipped Audi RS3 8V and 8Y, RSQ3 and TTRS models, the Milltek downpipe range offers multiple configurations to suit different performance requirements.

Whether you're building a Stage 2 street performance vehicle or a dedicated motorsport application, Milltek Sport provides a range of high-flow downpipe solutions designed for the turbocharged 2.5 TFSI platform.

Designed for the Audi 2.5 TFSI

The Audi 2.5 TFSI five-cylinder engine is renowned for its distinctive exhaust note, strong factory performance and impressive tuning potential.

The factory downpipe, catalytic converter and OPF/GPF system introduce exhaust restrictions, particularly when increasing boost pressure and engine output.

Milltek Sport large-bore downpipes are engineered to improve exhaust gas flow, reduce restriction and support increased performance when paired with appropriate supporting modifications and ECU calibration.

Downpipe Options

Select the correct downpipe configuration before ordering.

Large Bore Catalyst Delete – SSXAU817

Designed to replace the factory catalytic converter with a freer-flowing exhaust arrangement.

• 76.2mm / 3-inch pipework

• Large bore downpipe turbo elbow

• Catalyst and OPF/GPF bypass assembly

• Maximum exhaust flow without a catalytic converter

• Compatible with OE and Milltek Sport exhaust systems

• Stage 2 ECU calibration required

• Motorsport use only

Large Bore 200 CPSI Sports Cat – SSXAU818

A high-flow catalytic converter option designed to improve exhaust flow while retaining a sports catalyst.

• 76.2mm / 3-inch pipework

• Large bore downpipe turbo elbow

• 200 CPSI high-flow sports catalytic converter

• OPF/GPF bypass configuration

• Improved exhaust flow and performance potential

• Compatible with OE and Milltek Sport exhaust systems

• Stage 2 ECU calibration required

V2 De-Cat with OPF Bypass – SSXAU897

Developed for higher-output applications requiring increased exhaust flow.

• V2 large-bore downpipe configuration

• 100mm turbo elbow transitioning to twin 70mm outlets

• Left-hand OPF/GPF bypass connecting pipe

• Right-hand OPF/GPF bypass connecting pipe

• Catalyst-free exhaust configuration

• Designed for high-power performance builds

• Stage 2 ECU calibration required

• Motorsport use only

Key Features

• Milltek Sport large-bore downpipe system

• Designed for Audi 2.5 TFSI turbocharged engines

• Suits selected RS3 8V, RS3 8Y, RSQ3 and TTRS models

• Designed for OPF/GPF-equipped vehicles

• High-quality stainless steel construction

• Available in catalyst delete and high-flow sports catalyst configurations

• V2 downpipe option for higher-output applications

• Improved exhaust flow and reduced restriction

• More aggressive five-cylinder exhaust sound

• Designed to support Stage 2 performance upgrades

• Manufactured in the United Kingdom

• Professional installation required

Fitment

Audi RS3 8V

• RS3 Sportback 400PS – Facelift, 2019-On OPF/GPF models

• RS3 Sedan 400PS – 2019-On OPF/GPF models

Audi RS3 8Y

• RS3 Sportback 400PS – 2021-On OPF/GPF models

• RS3 Sedan 400PS – 2021-On OPF/GPF models

Audi RSQ3

• RSQ3 2.5 TFSI – 2020-On OPF/GPF-equipped models

• Sportback and SUV body styles

Audi TTRS

- TTRS Mk3 2.5 TFSI Quattro – 2019-On OPF/GPF-equipped models

Final fitment must be confirmed before ordering using the vehicle year, model, chassis, emissions specification and VIN where required.

Specifications

Brand: Milltek Sport Engine: Audi 2.5 TFSI Turbocharged Five-Cylinder Product: Large Bore Downpipe Material: Stainless Steel Pipe Diameter: 76.2mm / 3-inch (standard large-bore configurations) V2 Configuration: 100mm Turbo Elbow to Twin 70mm Outlets Catalyst Options: De-Cat / 200 CPSI High-Flow Sports Cat Emissions Specification: OPF/GPF Equipped Models ECU Calibration: Stage 2 Required Manufacturing: United Kingdom

Supporting Modifications

To achieve the best results from a Milltek Sport downpipe upgrade, additional supporting modifications may be recommended.

These can include:

• Stage 2 ECU calibration

• Performance intake system

• Upgraded turbo inlet

• Improved intercooler or charge cooling

• Performance cat-back exhaust system

• Supporting fuel system modifications for higher-output applications

Final requirements will depend on the selected downpipe configuration, vehicle specification, fuel type and performance target.

Installation Information

Professional installation is recommended.

All exhaust connections, clamps, sensors, brackets and associated hardware should be inspected during installation.

Following installation, appropriate ECU calibration and testing are required before high-load driving.

Important Notes

• Designed for OPF/GPF-equipped Audi 2.5 TFSI applications.

• Stage 2 ECU calibration is required.

• Select the correct downpipe configuration before ordering.

• De-cat and OPF/GPF bypass configurations are intended for motorsport or off-road use only where legally permitted.

• Sports catalyst versions are not automatically road legal.

• These systems are not E-marked.

• De-cat installations may make turbo wastegate rattle more noticeable than with the factory catalytic converter.

• Exhaust sound and performance will vary depending on vehicle modifications and calibration.

• Professional installation is required.

• Final vehicle compatibility must be confirmed before ordering.

• Product images may be generic and used for illustration purposes only.

• Available through Euroflow.

Why Choose Milltek Sport?

Milltek Sport is a leading British manufacturer of premium performance exhaust systems, specialising in high-quality exhaust solutions for European performance vehicles.

With extensive experience developing exhaust systems for Audi RS models, Milltek combines precise engineering, quality materials and performance-focused designs.

For Audi RS3, RSQ3 and TTRS owners chasing improved exhaust flow and the distinctive sound of the turbocharged five-cylinder engine, the Milltek large-bore downpipe range is an excellent upgrade.

Why Choose Euroflow?

Euroflow supplies premium performance parts and exhaust upgrades for European vehicles, with a focus on trusted brands, correct fitment and high-quality product support.

For Audi 2.5 TFSI owners building a Stage 2 or higher-output performance package, Euroflow offers a range of Milltek Sport exhaust solutions to suit their requirements