Milltek Downpipe & De-cat for Audi RSQ8 4.0 V8 Bi-Turbo (Non OPF/GPF Equipped Models) (2020 onwards) – Maximum Flow, Motorsport Use
This is Milltek's large-bore downpipe and de-cat for the Audi SQ7 4.0 V8 TT (Gasoline Non-OPF Equipped Vehicles Pre Facelift). 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
-
System Type: Large-bore Downpipe and De-cat
-
Pipe Diameter: 76.2mm (3")
-
EC Approved: No
-
Race System: Yes
-
Fitting Time: approx. 3.5 to 4.5 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 RSQ8 4.0 V8 Bi-Turbo (Non OPF/GPF Equipped Models) (2020 onwards)
- Audi SQ7 4.0 V8 TT (Gasoline Non-OPF Equipped Vehicles Pre Facelift) (2021 onwards)
- Audi SQ8 4.0 V8 Bi-Turbo (Non OPF/GPF Equipped Models Pre Facelift) (2020-2024)
Not suitable for: the Audi RSQ8 4.0 V8 Bi-Turbo (OPF/GPF Equipped Models), which needs the Milltek Downpipe & De-cat Audi RSQ8 4.0 V8 Bi-Turbo OPF/GPF 20+.
Installation
Milltek quotes a fitting time of approx. 3.5 to 4.5 hours. 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 Suspension Control Audi RSQ8 4.0 V8 Bi-Turbo Non OPF/GPF 20+, Milltek Front Pipe-back Exhaust Audi RSQ8 4.0 V8 Bi-Turbo Non OPF/GPF 20+.
Will it fit the Audi SQ7 4.0 V8 TT (Gasoline Non-OPF Equipped Vehicles Pre Facelift)?
Yes. Milltek lists this part for the Audi SQ7 4.0 V8 TT (Gasoline Non-OPF Equipped Vehicles Pre Facelift) as well as the other models in the fitment list above.
Does it fit the Audi RSQ8 4.0 V8 Bi-Turbo (OPF/GPF Equipped Models)?
No. For that car, choose the Milltek Downpipe & De-cat Audi RSQ8 4.0 V8 Bi-Turbo OPF/GPF 20+.
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?
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.
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. 3.5 to 4.5 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.
