Milltek Cat-back Exhaust for Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5-Door Hatchback (2016-2018) – Sharper Sound, Reduced Back Pressure
This is Milltek's cat-back system for the Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5-Door Hatchback. It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in resonated EC approved or non-resonated versions and 5 tailpipe finishes, so you can pick the setup that suits how the car's used.
It's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.
Specifications
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System Type: Cat-back
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Pipe Diameter: 76.2mm (3")
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Race System: No
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
- Replaces the standard exhaust from the catalytic converter back, so the factory cat is retained
- Choice of 5 tailpipe finishes: GT-115 Burnt Titanium, JET-115 Carbon Fibre, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium
- EC approved versions available
- Resonated (quieter) or non-resonated (louder) versions
- 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 Cat-back Exhaust Ford Focus Mk3 ST 2.0-litre EcoBoost 5dr Hatchback 12-18; the Ford Focus Mk3 ST 2.0-litre TDCi 5-Door Hatchback (Diesel), which needs the Milltek Cat-back Exhaust Ford Focus Mk3 ST 2.0-litre TDCi 5dr Hatchback Diesel 12-18; the Ford Focus Mk3 ST 2.0-litre EcoBoost Estate/Sedan/Limosine, which needs the Milltek Cat-back Exhaust Ford Focus Mk3 ST 2.0-litre EcoBoost Estate, Sedan & Limosine 12-18.
Installation
We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.
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 Downpipe & De-cat Ford Focus Mk3 RS 2.3-litre EcoBoost 4wd 5dr Hatchback 16-18.
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.
Which tailpipe finishes are available?
You can choose from: GT-115 Burnt Titanium, JET-115 Carbon Fibre, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium. The finish is cosmetic and does not change the sound.
Does it fit the Ford Focus Mk3 ST 2.0-litre EcoBoost 5-Door Hatchback?
No. For that car, choose the Milltek Cat-back Exhaust Ford Focus Mk3 ST 2.0-litre EcoBoost 5dr Hatchback 12-18.
Is it road legal?
Some versions are EC approved; check the EC Approved line in the specification for the option you choose.
Do I need a remap?
No. It fits behind the factory catalytic converter, so no software changes are needed.
Does it keep the factory catalytic converter?
Yes. It fits behind the factory catalytic converter, which stays in place.
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.
