Milltek GPF/OPF Bypass for Ford Focus Mk4 ST 2.3-litre EcoBoost Estate/Wagon/Combi (OPF/GPF Equipped) (2019 onwards) – Filter Delete, Motorsport Use
This is Milltek's GPF/OPF bypass pipe for the Ford Focus Mk4 ST 2.3-litre EcoBoost Hatch (OPF/GPF Equipped). 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 and versions to suit the factory or a Milltek system, 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
-
System Type: GPF/OPF Bypass
-
EC Approved: No
-
Race System: Yes
-
Fitting Time: approx. 1 to 1.5 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
- 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
- Ford Focus Mk4 ST 2.3-litre EcoBoost Estate/Wagon/Combi (OPF/GPF Equipped) (2019 onwards)
- Ford Focus Mk4 ST 2.3-litre EcoBoost Hatch (OPF/GPF Equipped) (2019 onwards)
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. 1 to 1.5 hours. Some versions: Non-Resonated to fit Milltek Sport Cat Back Only - Required Stage 2 ECU Remap. Some versions: Non-Resonated to fit OE Cat Back Only - Required Stage 2 ECU Remap. Some versions: Resonated to fit Milltek Sport Cat Back Only - Required Stage 2 ECU Remap. Some versions: Resonated to fit OE Cat Back Only - Required 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 Downpipe & De-cat Ford Focus Mk4 ST 2.3-litre EcoBoost Estate, Wagon & Combi OPF/GPF 19+, Milltek Filter-back Exhaust Ford Focus Mk4 ST 2.3-litre EcoBoost Estate, Wagon & Combi OPF/GPF 19+.
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 Ford Focus Mk4 ST 2.3-litre EcoBoost Hatch (OPF/GPF Equipped)?
Yes. Milltek lists this part for the Ford Focus Mk4 ST 2.3-litre EcoBoost Hatch (OPF/GPF Equipped) as well as the other models in the fitment list above.
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?
Yes. Milltek notes: "Fits Milltek Cat Back Only, Stage 2 Remap Required". 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.
How long does it take to fit?
Milltek quotes approx. 1 to 1.5 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.
