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Ford Focus ST Mk4 2.3 EcoBoost 2019+ Turbo Downpipe / Front Pipe - Sports Cat (High-Flow Catted) or Decat Catless - 3.5in (88.9mm) to 3in (76.2mm) TIG-Welded Stainless Performance Exhaust Turbo Outlet Pipe - Primary Cat Replacement
Ford Focus ST Mk4 2.3 EcoBoost 2019+ Turbo Downpipe / Front Pipe - Sports Cat (High-Flow Catted) or Decat Catless - 3.5in (88.9mm) to 3in (76.2mm) TIG-Welded Stainless Performance Exhaust Turbo Outlet Pipe - Primary Cat Replacement
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Pipework size: 3.5 inch (88.9 mm) reducing to 3 inch (76.2 mm)
Turbo front pipe upgrade for Mk4 Focus ST
Unlock flow, sound and response with a larger bore turbo outlet that replaces the restrictive factory primary section. This front pipe connects from the turbocharger to the centre section, using precision TIG-welded stainless construction for superb fitment and durability, delivering a stronger, deeper soundtrack and sharper throttle feel once mapped.
Choose your configuration
- Sports catalyst high-flow option for improved gas speed and a richer tone while retaining a catalytic element.
- De-cat straight-through race option for maximum flow and the most aggressive exhaust note. For track and off-road use only.
Why upgrade this section
- Big-bore tubing 88.9 mm to 76.2 mm for reduced backpressure and faster turbo spool.
- Beautiful TIG welds and quality stainless fabrication for long-term reliability.
- Direct fit from the turbo to the mid pipe. Designed to integrate with the rest of your system.
- Supplied with the required fittings and gaskets for installation.
Real-world results
We have fitted these at MJ Modifications and the feedback is consistently positive. Owners love the cleaner turbo whistle, stronger mid-range and the premium build quality. Pair with a suitable calibration to make the most of the increased flow.
Compatibility and important notes
- Fits from turbocharger outlet to the centre section.
- EML note: an ECU calibration is required at the time of install to prevent a warning light.
- GPF/OPF notice: connection to the standard petrol particulate filter section is not recommended. One of the OE downpipe’s GPF sensors is not accommodated on this part and would need to be blanked, which affects GPF functionality.
- Legal: the de-cat version is for motorsport and off-road use only. The sports catalyst replaces an original emissions device and is not EC homologated. This may not meet road-going emissions rules in your area.
Track-proven pedigree
Backed by top-flight motorsport experience. The same manufacturer provides performance exhaust solutions for Mk4 Focus ST cars campaigned by MB Motorsport accelerated by Blue Square and Motorbase Performance in the 2021 Kwik Fit British Touring Car Championship, with technology and learning transferred to road systems.
Fitting service
Want it installed professionally? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote.
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