Milltek Cat-back Exhaust for Ford Mustang 5.0 V8 Dark Horse (S650 Fastback) (2024 onwards) – Sharper Sound, Reduced Back Pressure
This is Milltek's cat-back system for the Ford Mustang 5.0 V8 Dark Horse (S650 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 4 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: 70mm (2.76")
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Tip Style: 115 GT
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EC Approved: No
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Race System: No
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Fitting Time: approx. 1 to 2 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 4 tailpipe finishes: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Ford Mustang 5.0 V8 Dark Horse (S650 Fastback) (2024 onwards)
- Ford Mustang 5.0 V8 Mach 1 (Fastback S550) (2021-2023)
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), which needs the Milltek Cat-back Exhaust Ford Mustang 5.0 V8 GT Fastback 15-18; 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+.
Installation
Milltek quotes a fitting time of approx. 1 to 2 hours. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.
Which tailpipe finishes are available?
You can choose from: GT-115 Brushed Titanium, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished. The finish is cosmetic and does not change the sound.
Will it fit the Ford Mustang 5.0 V8 Mach 1 (Fastback S550)?
Yes. Milltek lists this part for the Ford Mustang 5.0 V8 Mach 1 (Fastback S550) as well as the other models in the fitment list above.
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?
Milltek does not list EC approval for this part. Any exhaust used on the road must still meet noise and emissions rules, so check the requirements where you live.
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 2 hours.
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.
