Ford Focus ST (Mk4) GPF / PPF Delete Performance Exhaust

OPF/PPF Bypass Pipe for Focus ST Mk4 — louder, freer flowing, track-ready

Unlock the soundtrack your hot hatch deserves with this Cobra Sport particulate filter removal section for the Mk4 ST. This high-quality stainless steel replacement pipe uses 3 inch 76.2 mm mandrel-bent tubing and precision TIG welding to remove a major restriction after the turbo, delivering a noticeably more aggressive tone, sharper response and a far more engaging drive.

If you are searching for OPF delete, GPF delete pipe, PPF bypass, OPF removal, particulate filter delete, OPF replacement section or Focus ST Mk4 mid-pipe upgrade, this is the direct-fit solution. Designed to install between the factory downpipe and the centre section, it swaps out the original petrol particulate filter section for a smooth, high-flow route that really lets the 2.3 EcoBoost breathe.

Why enthusiasts choose this Cobra Sport OPF delete

• 3 inch 76.2 mm stainless steel tubing for maximum gas flow and reduced back pressure
• TIG-welded construction for an exact fit and long-term durability
• Transforms volume and character with a sportier, more purposeful note
• Direct replacement for the OE particulate filter section from downpipe to centre
• Supplied with all required gaskets and fittings for installation
• Track and motorsport use only, as it removes the petrol particulate filter

We run this hardware on customer builds and the feedback is consistently excellent. Owners report a deeper tone, more presence across the rev range and a properly exciting soundtrack on throttle without the dull, muted feel of the stock setup.

Technical pedigree you can trust

Cobra Sport’s precision TIG welding and motorsport development speak for themselves. Their systems support competitive teams in the Kwik Fit British Touring Car Championship, with track-proven know-how flowing straight into these road-going upgrades.

Fitment and setup

• Application: Mk4 ST 2.3 EcoBoost, fits between the turbo downpipe and centre section
• Also known as: OPF delete pipe, GPF removal pipe, PPF bypass, OPF replacement section
• ECU note: an engine calibration is required at installation to prevent the EML and to account for the removal of the particulate filter
• Legal note: for competition and off-road use only due to emissions equipment removal

Professional installation available

Want it fitted by specialists who build fast Fords all day long? Book your installation with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored quote and availability.

Search-friendly terms you might recognise

Focus ST Mk4 OPF delete, Mk4 ST GPF delete pipe, PPF delete pipe Focus, OPF bypass tube, particulate filter removal section, straight-through mid pipe, downpipe to centre section upgrade, 3 inch exhaust section, stainless OPF delete Focus ST.