Milltek Cat-back Exhaust for Ford Mustang 5.0 V8 GT (Fastback) (2015-2018) – Sharper Sound, Reduced Back Pressure
This is Milltek's cat-back system for the Ford Mustang 5.0 V8 GT (Fastback). 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 non-resonated, resonated EC approved or resonated versions, 9 tailpipe finishes and valved or non-valved versions, 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: 70mm (2.76")
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Race System: No
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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
- 70mm (2.76") pipework
- Replaces the standard exhaust from the catalytic converter back, so the factory cat is retained
- Choice of 9 tailpipe finishes: GT-100 Black, GT-100 Burnt Titanium, GT-100 Polished, GT-100 Titanium, GT-100 Cerakote Black, GT-90 Black, GT-90 Polished, GT-90 Titanium and more
- EC approved versions available
- Valved versions available for switchable volume
- Resonated (quieter) or non-resonated (louder) versions
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Ford Mustang 5.0 V8 GT (Fastback) (2015-2018)
Not suitable for: the Ford Mustang 5.0 V8 GT (S650 Fastback), which needs the Milltek Cat-back Exhaust Ford Mustang 5.0 V8 GT S650 Fastback 24+; the Ford Mustang 5.0 V8 GT (Fastback - Facelift Model), which needs the Milltek Cat-back Exhaust Ford Mustang 5.0 V8 GT Fastback - Facelift Model 19+; the Ford Mustang 5.0 V8 Dark Horse (S650 Fastback), which needs the Milltek Cat-back Exhaust Ford Mustang 5.0 V8 Dark Horse S650 Fastback 24+.
Installation
Milltek quotes a fitting time of approx. 1 to 1.5 hours. Some versions: Non Res (Louder) with Quad Black GT-90 Tips - Requires Roush Rear Valance. Some versions: Non Res (Louder) with Quad Polished GT-90 Tips - Requires Roush Rear Valance. Some versions: Non Res (Louder) with Quad Titanium GT-90 Tips - Requires Roush Rear Valance. Some versions: Resonated (Quieter) with Quad Black GT-90 Tips - Requires Roush Rear Valance. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.
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.
Should I choose the valved or non-valved version?
The valved version lets you switch between a quieter tone and the full exhaust note. Choose non-valved if you want the same sound all the time.
Which tailpipe finishes are available?
You can choose from: GT-100 Black, GT-100 Burnt Titanium, GT-100 Polished, GT-100 Titanium, GT-100 Cerakote Black, GT-90 Black, GT-90 Polished, GT-90 Titanium, GT-90 Burnt Titanium. The finish is cosmetic and does not change the sound.
Does it fit the Ford Mustang 5.0 V8 GT (S650 Fastback)?
No. For that car, choose the Milltek Cat-back Exhaust Ford Mustang 5.0 V8 GT S650 Fastback 24+.
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.
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.
