Milltek GPF/OPF Bypass for BMW 3 Series G80/G81 M3 & M3 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) inc Touring & XDrive Models (2020 onwards) – Filter Delete, Motorsport Use
This is Milltek's GPF/OPF bypass pipe for the BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only). It replaces the section of pipe housing the factory petrol particulate filter with a straight-through pipe, clearing the last major restriction left in a modern turbocharged petrol exhaust once a de-cat and remap are already in place. It's offered in non-resonated or resonated versions, so you can pick the setup that suits how the car's used.
It's aimed at owners already running a de-cat and a supporting remap who want to clear the final restriction in the system, not a bolt-on for a car that needs to stay road legal.
Because it removes the particulate filter, it's intended for off-road and competition use. A car with the GPF/OPF removed will fail an MOT emissions test and isn't legal to use on UK roads.
Specifications
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System Type: GPF/OPF 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
- Straight-through pipe in place of the factory petrol particulate filter (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 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 (OPF/GPF Equipped Cars Only) (2020 onwards)
Not suitable for: the BMW 3 Series F80 M3, M3 Competition & M3 CS Saloon (OPF/GPF Models Only), which needs the Milltek GPF OPF Bypass BMW 3 Series F80 M3, M3 Comp M3 CS Saloon OPF/GPF 19-20.
Installation
The fitting time varies by version; see the specification table for the option you choose. Some versions: OPF/GPF Bypass - Non-Resonated (Louder) - Fits to OE Downpipes & Milltek Sport Axle Back System Only - Requires Stage 2 ECU Remap or OPF/GPF Bypass Module (Available from www.leib-engineering.de). Some versions: OPF/GPF Bypass - Non-Resonated (Louder) - Fits to OE Downpipes & OE Axle Back System Only (OE Requires Cutting) - Requires Stage 2 ECU Remap or OPF/GPF Bypass Module (Available from www.leib-engineering.de). Some versions: OPF/GPF Bypass - Resonated - Fits to OE Downpipes & Milltek Sport Axle Back System Only - Requires Stage 2 ECU Remap or OPF/GPF Bypass Module (Available from www.leib-engineering.de). Some versions: OPF/GPF Bypass - Resonated - Fits to OE Downpipes & OE Axle Back System Only (OE Requires Cutting) - Requires Stage 2 ECU Remap or OPF/GPF Bypass Module (Available from www.leib-engineering.de). 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.
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.
Will it fit the BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only)?
Yes. Milltek lists this part for the BMW 4 Series G82 M4 & M4 Competition S58 3.0 Turbo (OPF/GPF Equipped Cars Only) as well as the other models in the fitment list above.
Does it fit the BMW 3 Series F80 M3, M3 Competition & M3 CS Saloon (OPF/GPF Models Only)?
No. For that car, choose the Milltek GPF OPF Bypass BMW 3 Series F80 M3, M3 Comp M3 CS Saloon OPF/GPF 19-20.
Is it road legal?
No. Removing the particulate filter 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.
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.
