Milltek Filter-back Exhaust for Audi S8 D5 4.0 TFSI V8 Saloon/Sedan - Standard Wheel Base (Non OPF/GPF US/ROW Models) (2020 onwards) – Sharper Sound, Filter Retained
This is Milltek's particulate filter-back system for the Audi S8 D5 4.0 TFSI V8 Saloon/Sedan (OPF/GPF UK/Euro Models). It replaces everything downstream of the factory diesel or petrol particulate filter with wider-bore pipework and re-tuned silencers, cutting back pressure and sharpening the exhaust note. The filter itself is left exactly where the manufacturer fitted it, so emissions equipment is unaffected. It's offered in non-resonated or resonated EC approved versions and 5 tailpipe finishes, so you can pick the setup that suits how the car's used.
It's the right choice if you want a sportier sound and a genuine, if modest, flow improvement on a filter-equipped car, without going anywhere near the parts of the system that keep it emissions-compliant.
Specifications
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System Type: Particulate Filter-back
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Pipe Diameter: 80mm (3.15")
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Race System: No
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Fitting Time: approx. 2.5 to 3.5 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
- 80mm (3.15") pipework
- Fits behind the factory particulate filter, which stays in place
- Choice of 5 tailpipe finishes: GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium, JET-115 Carbon Fibre
- EC approved versions available
- Resonated (quieter) or non-resonated (louder) versions
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Audi S8 D5 4.0 TFSI V8 Saloon/Sedan - Standard Wheel Base (Non OPF/GPF US/ROW Models) (2020 onwards)
- Audi S8 D5 4.0 TFSI V8 Saloon/Sedan (OPF/GPF UK/Euro Models) (2020 onwards)
Not suitable for: Audi S8 D5 OPF/GPF US/ROW models, or any model not listed above.
Installation
Milltek quotes a fitting time of approx. 2.5 to 3.5 hours. Some versions: Non-Resonated (Louder) OPF/GPF Back System (Twin 80mm) with GT-115 Burnt Titanium Trims (Does Not Require Cutting of the OE System). Some versions: Non-Resonated (Louder) OPF/GPF Back System (Twin 80mm) with GT-115 Cerakote Black Trims (Does Not Require Cutting of the OE System). Some versions: Non-Resonated (Louder) OPF/GPF Back System (Twin 80mm) with GT-115 Polished Trims (Does Not Require Cutting of the OE System). Some versions: Non-Resonated (Louder) OPF/GPF Back System (Twin 80mm) with GT-115 Titanium Trims (Does Not Require Cutting of the OE System). 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.
Which tailpipe finishes are available?
You can choose from: GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium, JET-115 Carbon Fibre. The finish is cosmetic and does not change the sound.
Will it fit the Audi S8 D5 4.0 TFSI V8 Saloon/Sedan (OPF/GPF UK/Euro Models)?
Yes. Milltek lists this part for the Audi S8 D5 4.0 TFSI V8 Saloon/Sedan (OPF/GPF UK/Euro Models) as well as the other models in the fitment list above.
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 particulate filter, so no software changes are needed.
Does it keep the factory particulate filter?
Yes. It fits behind the factory particulate filter, which stays in place.
How long does it take to fit?
Milltek quotes approx. 2.5 to 3.5 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.
