Milltek Sport Downpipes & Cat-Back - 2022-2025 Audi RS3 8Y Sedan

These Milltek Sport parts fit the 2022-2025 Audi RS3 sedan (8Y) with the 2.5 liter TFSI turbo five. This page carries Milltek parts for the 8Y RS3 sedan: a large-bore 200-cell catted downpipe, catless downpipes, a secondary cat bypass, and three 80 mm cat-back systems. A Milltek hot-side part replaces the restrictive factory section with larger, smoother T304L tubing, so exhaust gas leaves the engine with less resistance. Pick a catted version to keep a catalytic converter in the system, or a catless version for a dedicated track car. Where an option names a Milltek cat-back in parentheses, that version is made to join it. The Audi RS3 8Y parts are T304L stainless steel with mandrel-bent tubing, which keeps the pipe at full size through each bend and resists corrosion for years. They bolt in place of the factory parts with no cutting or welding.

How to Choose

Choose the Part you need. Secondary Cat Bypass replaces the secondary catalytic converters with a straight pipe (race product); it is not needed with a Milltek turbo-back system, and not every car has secondary cats, so please check under your car first. Catless Downpipe has no catalytic converter; it is for off-road and track use only and needs an ECU remap. Catless Downpipe V2 is the second version of Milltek's catless downpipe; it is for off-road and track use only and needs an ECU remap. Catted 200-Cell Downpipe is a large-bore downpipe with a high-flow 200-cell catalyst; Milltek lists it as a race product and it needs an ECU remap. 80mm Cat-Back, Non-Resonated is the 80 mm non-resonated system for a bold five-cylinder sound. 80mm Race Cat-Back, Non-Resonated (Loudest) is the 80 mm race non-resonated system, the loudest option. 80mm Cat-Back, Resonated (Quieter) is the 80 mm resonated system for a deeper tone with less drone.

Features

• 80 mm (3.15 in) T304L stainless steel pipework
• Mandrel-bent and made to bolt to the factory mounting points
• Catted and catless options explained in How to Choose

What's Included

• The Milltek part for the version you choose: a downpipe, the left and right secondary cat bypass pipes, or a complete 80 mm cat-back system

Specifications

Fitment Notes

• Fits the 2022-2025 US-market Audi RS3 sedan (8Y). For 2026 cars, please call us to confirm. Not for the 2017-2020 RS3 8V, which has its own page.
• Every downpipe here fits both the factory and the Milltek cat-back. Because of the turbo wastegate design, a catless downpipe can cause a metallic rattle, according to Milltek.
• The three 80 mm systems replace everything from the particulate filter or cat back; Milltek does not list them as race products.
• Catless parts remove the catalytic converter. They are sold for off-road and competition use only and are not legal on public roads in the US.

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.