Milltek Downpipe & Sports Cat for Audi S3 2.0TFSI Quattro Saloon/Sedan 310PS & 333PS 8Y (OPF/GPF Models Only) (2020 onwards) – Improved Flow, Sports Catalyst
This is Milltek's large-bore downpipe with hi-flow sports cat for the Audi S3 2.0TFSI Quattro Sportback 310PS & 333PS 8Y (OPF/GPF Models Only). It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it. It's offered in a choice of cat (HJS 200 Cell Sports Cat, 200 Cell Race Cat) and versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.
It sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.
In the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.
Specifications
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System Type: Large Bore Downpipe and Hi-Flow Sports Cat
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Pipe Diameter: 94mm (3.7")
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EC Approved: No
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Race System: Yes
Key Features
- Made from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration
- Mandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow
- 94mm (3.7") pipework
- High-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Audi S3 2.0TFSI Quattro Saloon/Sedan 310PS & 333PS 8Y (OPF/GPF Models Only) (2020 onwards)
- Audi S3 2.0TFSI Quattro Sportback 310PS & 333PS 8Y (OPF/GPF Models Only) (2020 onwards)
- Volkswagen Golf Mk8 R 2.0 TSI 320PS (GPF Equipped Models Only) (2021-2024)
- Volkswagen Golf Mk8.5 R (333ps OPF/GPF Equipped Models Only) (2024 onwards)
- Seat Cupra Formentor 2.0TFSI 4Drive 310PS & 333PS (MQB EVO EA888.4 OPF/GPF Vehicles) (2021 onwards)
- Volkswagen Tiguan R 320ps EA888.4 MQB EVO (OPF/GPF Models Only) (2021 onwards)
- Volkswagen T-Roc R 2.0TSI 300ps (MQB EVO Models with OPF/GPF) (2022 onwards)
Not every version fits every car in this list. Check the fitment shown for the option you select.
Not suitable for: the Audi S3 2.0TFSI Quattro Saloon/Sedan 310PS 8Y (North American/Non-OPF Models Only), which needs the Milltek Downpipe & Sports Cat Audi S3 2.0TFSI Quattro Saloon 8Y North American Non-OPF 22+.
Installation
Some versions: 94mm/3.7inch ID Turbo Outlet to 80mm/3.15inch Downpipe with 200CPSI HJS Cat - Fits with Milltek OPF/GPF Back System Only. Some versions: 94mm/3.7inch ID Turbo Outlet to 80mm/3.15inch Downpipe with 200CPSI HJS Cat - Fits with OE OPF/GPF Back System Only. Some versions: 94mm/3.7inch ID Turbo Outlet to 80mm/3.15inch Downpipe with 200CPSI Race Cat - Fits with Milltek OPF/GPF Back System Only. Some versions: 94mm/3.7inch ID Turbo Outlet to 80mm/3.15inch Downpipe with 200CPSI Race Cat - Fits with OE OPF/GPF Back System Only. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.
Upgrade Further
Also available from Milltek for this car: Milltek Filter-back Exhaust Audi S3 2.0TFSI Quattro Saloon 8Y OPF/GPF 20+.
Will it fit the Audi S3 2.0TFSI Quattro Sportback 310PS & 333PS 8Y (OPF/GPF Models Only)?
Yes. Milltek lists this part for the Audi S3 2.0TFSI Quattro Sportback 310PS & 333PS 8Y (OPF/GPF Models Only) as well as the other models in the fitment list above.
Does it fit the Audi S3 2.0TFSI Quattro Saloon/Sedan 310PS 8Y (North American/Non-OPF Models Only)?
No. For that car, choose the Milltek Downpipe & Sports Cat Audi S3 2.0TFSI Quattro Saloon 8Y North American Non-OPF 22+.
Is it road legal?
Milltek lists this as a race part without EC approval, so it is intended for off-road and competition use.
Do I need a remap?
A suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.
Can I use it with my standard exhaust?
It depends on the version. Some are made for the factory (OE) system and others for the Milltek cat-back, so check the notes for the option you choose.
How is a sports cat different from a de-cat?
A sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.
What is it made from?
T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.
Is there a warranty?
Yes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.
