Milltek Downpipe & Sports Cat for Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5-Door Hatchback (2016-2018) – Improved Flow, Sports Catalyst
This is Milltek's large-bore downpipe with hi-flow sports cat for the Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5-Door Hatchback. It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it. It's offered in versions to suit the factory or a Milltek system, so you can pick the setup that suits how the car's used.
It sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.
In the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.
Specifications
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System Type: Large Bore Downpipe and Hi-Flow Sports Cat
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Pipe Diameter: 76.2mm (3")
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Tip Style: 76.2
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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
- 76.2mm (3") pipework
- High-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5-Door Hatchback (2016-2018)
Not suitable for: the Ford Focus Mk3 ST 2.0-litre EcoBoost 5-Door Hatchback, which needs the Milltek Downpipe & Sports Cat Ford Focus Mk3 ST 2.0-litre EcoBoost 5dr Hatchback 12-18.
Installation
Some versions: Large Bore Downpipe with 200 Cell High Flow Cat. Requires Stage 2 ECU Remap. For fitment to Milltek Sport Cat Back Only. Some versions: Large Bore Downpipe with 200 Cell High Flow Cat. Requires Stage 2 ECU Remap. For fitment to OE Cat Back Only. 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 Active Valve Control Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5dr Hatchback 16-18, Milltek Cat-back Exhaust Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5dr Hatchback 16-18.
Does it fit the Ford Focus Mk3 ST 2.0-litre EcoBoost 5-Door Hatchback?
No. For that car, choose the Milltek Downpipe & Sports Cat Ford Focus Mk3 ST 2.0-litre EcoBoost 5dr Hatchback 12-18.
Is it road legal?
Milltek lists this as a race part without EC approval, so it is intended for off-road and competition use.
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 is a sports cat different from a de-cat?
A sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.
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.
