Milltek Manifold including Cat Bypass New for New Mini Mk1 (R50) Cooper 1.6i (2001-2006) – Maximum Flow, Motorsport Use
This is Milltek's large-bore downpipe and de-cat for the New Mini Mk1 (R52) Cooper S Convertible. 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: Manifold (including Cat Bypass)
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Pipe Diameter: 63.5mm (2.5")
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EC Approved: No
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Race System: Yes
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Fitting Time: approx. 2 to 3 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
- 63.5mm (2.5") 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
- New Mini Mk1 (R50) Cooper 1.6i (2001-2006)
- New Mini Mk1 (R50) One 1.6i (2001-2006)
- New Mini Mk1 (R52) Cooper S Convertible (2004-2008)
- New Mini Mk1 (R53) Cooper S (2002-2006)
Not suitable for: any model, engine or body style not listed above. Check your car before ordering.
Installation
Milltek quotes a fitting time of approx. 2 to 3 hours. Before ordering, note: Two Piece Design (Removable Cat/Decat Section), Fits with OE and Milltek Sport Cat Back - 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 New Mini Mk1 R50 Cooper 1.6i 01-06.
Will it fit the New Mini Mk1 (R50) One 1.6i?
Yes. Milltek lists this part for the New Mini Mk1 (R50) One 1.6i as well as the other models in the fitment list above.
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: "Two Piece Design (Removable Cat/Decat Section), Fits with OE and Milltek Sport Cat Back - Requires a Stage 2 ECU remap". Without suitable software the engine management is likely to log faults.
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.
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. 2 to 3 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.
