Milltek Decat Downpipe for BMW 4 Series G82 M4 Comp S58 3.0 Turbo OPF/GPF 2020 onwards
This is Milltek's large-bore downpipe and de-cat for the BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only). It replaces the factory downpipe with a large-bore pipe and removes the catalytic converter.
Because it removes the catalytic converter, it's intended for off-road and competition use. Missing or modified manufacturer-fitted emissions equipment, such as the catalytic converter, is a major defect at the MOT, so the car isn't road legal set up this way.
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
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Fitting Time: approx. 3 to 4 hours (Milltek figure)
Key Features
- Made from T304L aircraft-grade stainless steel, which Milltek says resists degradation and discolouration better than many other grades
- Mandrel-bent pipework, which keeps the pipe diameter consistent through the bends
- 76.2mm (3") pipework
- Removes the factory catalytic converter (off-road and competition use only)
- 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)
- BMW 2 Series M2 Coupe (G87 S58 OPF/GPF Models) (2023 onwards)
- BMW 3 Series G80 M3 & M3 Competition S58 3.0 Turbo (North American/ROW Non-OPF/GPF Cars Only) (2021 onwards)
- BMW 3 Series G80/G81 M3 & M3 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) inc Touring & XDrive Models (2020 onwards)
- BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (North American/ROW Non-OPF/GPF Cars Only) (2021 onwards)
- BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) (2020 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
Milltek quotes a fitting time of approx. 3 to 4 hours. Before ordering, note: Requires Stage 2 ECU Remap - Fits to OE and Milltek 3" GPF Delete Sport Systems. 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+, Milltek GPF/OPF Bypass BMW 2 Series M2 Coupe G87 S58 OPF/GPF 23+.
Will it fit the BMW 2 Series M2 Coupe (G87 S58 OPF/GPF Models)?
Yes. Milltek lists this part for the BMW 2 Series M2 Coupe (G87 S58 OPF/GPF Models) as well as the other models in the fitment list above.
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. A missing catalytic converter is a major defect at the MOT, so it is for off-road and competition use only.
Do I need a remap?
Speak to your tuner before fitting, as removing the catalytic converter changes the readings the engine management expects.
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.
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 Milltek says resists degradation and discolouration better than many other grades.
Is there a warranty?
Yes. Milltek's guarantee is 2 years or 80,000km for downpipes, hi-flow catalysts and parts with valves, 2 years for electronic products, and lifetime for its other products. Milltek's Limited Warranty applies to the original purchaser only and is not transferable, and other terms apply. Contact us with your order number if you have a problem.
