Milltek Cat Replacement Pipes for Audi RS4 B9 2.9 V6 Turbo Avant (Non OPF/GPF Models) (2018 onwards) – Maximum Flow, Motorsport Use
This is Milltek's large-bore downpipe and de-cat for the Audi RS5 B9.5 2.9 V6 Turbo Sportback (Non OPF Models). It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone.
It's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.
Because it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.
Specifications
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System Type: Cat Replacement Pipes
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Pipe Diameter: 76.2mm (3")
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EC Approved: No
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Race System: Yes
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Fitting Time: approx. 3 to 4 hours (Milltek figure)
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
- 76.2mm (3") pipework
- Removes the factory catalyst for maximum flow (off-road and competition use only)
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Audi RS4 B9 2.9 V6 Turbo Avant (Non OPF/GPF Models) (2018 onwards)
- Audi RS5 B9 2.9 V6 Turbo Coupe (Non OPF/GPF Models) (2017-2019)
- Audi RS5 B9 2.9 V6 Turbo Sportback (Non-OPF/GPF Models) (2018-2019)
- Audi RS5 B9.5 2.9 V6 Turbo Coupe (Non OPF Models) (2019 onwards)
- Audi RS5 B9.5 2.9 V6 Turbo Sportback (Non OPF Models) (2019 onwards)
Not suitable for: the Audi RS4 B9 2.9 V6 Turbo Avant (OPF/GPF Models), which needs the Milltek Downpipe & De-cat Audi RS4 B9 2.9 V6 Turbo Avant OPF/GPF 19+.
Installation
Milltek quotes a fitting time of approx. 3 to 4 hours. Before ordering, note: (Requires stage 2 ECU remap). 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 Active Valve Control Audi RS4 B9 2.9 V6 Turbo Avant Non OPF/GPF 18+, Milltek Cat-back Exhaust Audi RS4 B9 2.9 V6 Turbo Avant Non OPF/GPF 18+.
Will it fit the Audi RS5 B9 2.9 V6 Turbo Coupe (Non OPF/GPF Models)?
Yes. Milltek lists this part for the Audi RS5 B9 2.9 V6 Turbo Coupe (Non OPF/GPF Models) as well as the other models in the fitment list above.
Does it fit the Audi RS4 B9 2.9 V6 Turbo Avant (OPF/GPF Models)?
No. For that car, choose the Milltek Downpipe & De-cat Audi RS4 B9 2.9 V6 Turbo Avant OPF/GPF 19+.
Is it road legal?
No. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.
Do I need a remap?
Yes. Milltek notes: "(Requires stage 2 ECU remap)". Without suitable software the engine management is likely to log faults.
Will removing the cat cause a warning light?
Without suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.
How long does it take to fit?
Milltek quotes approx. 3 to 4 hours.
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.
