Milltek Secondary Catalyst Bypass for BMW 2 Series M2 Coupe (G87 S58 NAS Non-OPF/GPF Models) (2023 onwards) – Maximum Flow, Motorsport Use
This is Milltek's large-bore downpipe and de-cat for the BMW 2 Series M2 Coupe (G87 S58 NAS Non-OPF/GPF 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 offered in non-resonated or resonated versions, so you can pick the setup that suits how the car's used.
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: Secondary Catalyst Bypass
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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
- Removes the factory catalyst for maximum flow (off-road and competition use only)
- Resonated (quieter) or non-resonated (louder) versions
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 2 Series M2 Coupe (G87 S58 NAS Non-OPF/GPF Models) (2023 onwards)
Not suitable for: the BMW 2 Series M240i Coupé (G42 XDrive - NAS Non OPF/GPF Models Only), which needs the Milltek Downpipe & De-cat BMW 2 Series M240i Coupé (G42 XDrive - NAS Non OPF/GPF Only) 22+; the BMW 2 Series M240i Coupé (G42 XDrive OPF/GPF Models Only - Non Hybrid Pre LCI), which needs the Milltek Downpipe & De-cat BMW 2 Series M240i Coupé (G42 XDrive OPF/GPF - Non Hybrid Pre LCI) 22-25; the BMW 2 Series M2 Competition Coupé (F87), which needs the Milltek Downpipes & Cat Bypass Pipes BMW 2 Series M2 Comp Coupé F87 18+.
Installation
The fitting time varies by version; see the specification table for the option you choose. Some versions: Secondary Cat Bypass - Non Resonated to OE Axle Back Only. Some versions: Secondary Cat Bypass - Resonated to OE Axle Back Only. Some versions: Single Mid Pipe 102mm - Non Resonated to Milltek Axle Back Only - NOTE Does not require MSBM406 if installing with Milltek Downpipes. Some versions: Single Mid Pipe 102mm - Non Resonated to OE Axle Back Only - NOTE Does not require MSBM406 if installing with Milltek Downpipes. 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 BMW 2 Series M2 Coupe G87 S58 NAS Non-OPF/GPF 23+.
What's the difference between the resonated and non-resonated versions?
The resonated version adds extra silencing for a quieter, more refined tone. The non-resonated version leaves it out, so it is louder and more aggressive.
Does it fit the BMW 2 Series M240i Coupé (G42 XDrive - NAS Non OPF/GPF Models Only)?
No. For that car, choose the Milltek Downpipe & De-cat BMW 2 Series M240i Coupé (G42 XDrive - NAS Non OPF/GPF Only) 22+.
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.
Can I use it with my standard exhaust?
Yes. Milltek lists it for use with the factory (OE) exhaust system.
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?
It depends on the version. Milltek's fitting time for each option is shown in its specification table.
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.
