Milltek Downpipe & De-cat for Audi TT Mk2 TTS quattro (2008-2014) – Maximum Flow, Motorsport Use
This is Milltek's large-bore downpipe and de-cat for the Audi TT Mk2 TTS quattro. 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: Large-bore Downpipe and De-cat
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Pipe Diameter: 76.2mm (3")
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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
- 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 TT Mk2 TTS quattro (2008-2014)
Not suitable for: the Audi TT Mk2 2.0 TFSi 2WD, which needs the Milltek Downpipe & De-cat Audi TT Mk2 2.0 TFSi 2WD 06-11.
Installation
Before ordering, note: Must be fitted with the Milltek Sport 2.75" cat-back systems and requires a 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 Cat-back Exhaust Audi TT Mk2 TTS Quattro 08-14.
Does it fit the Audi TT Mk2 2.0 TFSi 2WD?
No. For that car, choose the Milltek Downpipe & De-cat Audi TT Mk2 2.0 TFSi 2WD 06-11.
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: "Must be fitted with the Milltek Sport 2.75" cat-back systems and requires a 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.
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.
