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- Regular price
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Vendor:
Milltek Sport
SKU:
SSXAU948
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Overview
Upgrade the Audi S8 D5 4.0 TFSI V8 Saloon / Sedan - Standard Wheel Base (2020+) with a Milltek Sport cat-back exhaust. Milltek builds each system around the car it fits: mandrel-bent T304L stainless pipework, a larger bore than stock for freer flow, and a tuned sound you choose, from quiet and refined to loud and uncorked.
Sound options
- Resonated options keep cruising drone down and sound closer to a refined sports car.
- Non-resonated (louder / race) options give the loudest, rawest note. Better for track days and weekend cars than daily commuting.
Choose your setup
- Sound: the system type and sound level.
- Tip Finish: the tailpipe trim.
- Optional Downpipe: add a Milltek catted or catless downpipe built to fit this cat-back. Pick Cat-Back Only to skip it.
Cat-back systems: compare every part number
| Part # | Sound | Tip finish | Pipe size | Fit time | Race/Track only |
|---|---|---|---|---|---|
| SSXAU948 | Non-Resonated (Louder) Cat Back System (Twin 80mm) (Does Not Require Cutting of the OE System) | Polished GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU949 | Non-Resonated (Louder) Cat Back System (Twin 80mm) (Does Not Require Cutting of the OE System) | Cerakote Black GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU950 | Non-Resonated (Louder) Cat Back System (Twin 80mm) (Does Not Require Cutting of the OE System) | Titanium GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU951 | Non-Resonated (Louder) Cat Back System (Twin 80mm) (Does Not Require Cutting of the OE System) | Burnt Titanium GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU952 | Non-Resonated (Louder) Cat Back System (Twin 80mm) with JET-115 Carbon Trims (Does Not Require Cutting of the OE System) | Standard (OE Tips) | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU943 | Resonated Cat Back Back System (Twin 80mm) (Does Not Require Cutting of the OE System) - EC Approval Awaiting Testing | Polished GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU944 | Resonated Cat Back System (Twin 80mm) (Does Not Require Cutting of the OE System) - EC Approval Awaiting Testing | Cerakote Black GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU945 | Resonated Cat Back System (Twin 80mm) (Does Not Require Cutting of the OE System) - EC Approval Awaiting Testing | Titanium GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU946 | Resonated Cat Back System (Twin 80mm) (Does Not Require Cutting of the OE System) - EC Approval Awaiting Testing | Burnt Titanium GT-115 | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
| SSXAU947 | Resonated Cat Back System (Twin 80mm) with JET-115 Carbon Trims (Does Not Require Cutting of the OE System) - EC Approval Awaiting Testing | Standard (OE Tips) | 3.15" (80.00mm) | 2.50 to 3.50 hours | - |
What comes with each cat-back
- SSXAU948: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer Replacement Pipe; 1 x RH Front Silencer Replacement Pipe; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Polished 4.5" Trims; 115 GT
- SSXAU949: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer Replacement Pipe; 1 x RH Front Silencer Replacement Pipe; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Cerakote Black 4.5" Trims; 115 GT
- SSXAU950: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer Replacement Pipe; 1 x RH Front Silencer Replacement Pipe; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Titanium 4.5" Trims; 115 GT
- SSXAU951: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer Replacement Pipe; 1 x RH Front Silencer Replacement Pipe; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Burnt Titanium 4.5" Trims; 115 GT
- SSXAU952: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer Replacement Pipe; 1 x RH Front Silencer Replacement Pipe; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Carbon Fibre 4.5" Trims; 115 JET
- SSXAU943: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer; 1 x RH Front Silencer; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Polished 4.5" Trims; 115 GT
- SSXAU944: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer; 1 x RH Front Silencer; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Cerakote Black 4.5" Trims; 115 GT
- SSXAU945: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer; 1 x RH Front Silencer; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Titanium 4.5" Trims; 115 GT
- SSXAU946: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer; 1 x RH Front Silencer; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Burnt Titanium 4.5" Trims; 115 GT
- SSXAU947: 1 x LH Lower Downpipe; 1 x RH Lower Downpipe; 1 x LH Front Silencer; 1 x RH Front Silencer; 1 x Active Centre Section; 1 x LH Connecting Pipe; 1 x RH Connecting Pipe; 1 x LH Rear Silencer; 1 x RH Rear Silencer; 1 x LH Valved Outlet Pipe; 1 x RH Valved Outlet Pipe; 4 x Carbon Fibre 4.5" Trims; 115 JET
Downpipe options: compare every part number
| Part # | Option | Fits with (Milltek) | Stage 2 ECU remap | Race/Track only | Pipe size |
|---|---|---|---|---|---|
| SSXAU907 | Catless Downpipe (Race/Track only) Bypass: Fits to Milltek Sport Cat Back System - Requires Stage 2 ECU Software | Fits to Milltek Sport Cat Back System - Requires Stage 2 ECU Software | Required | Yes | 3.15" (80.00mm) |
| SSXAU909 | Catted Downpipe (200CPSI HJS Cat, Race/Track only): Fits to Milltek Sport Catback Back System - Requires Stage 2 ECU Software | Fits to Milltek Sport Catback Back System - Requires Stage 2 ECU Software | Required | Yes | 3.15" (80.00mm) |
"Race/Track only" and "Stage 2 ECU remap" are shown only where Milltek states them. A dash means Milltek does not state it for that part.
What comes with each downpipe option
- SSXAU907: 1 x Heat Wrapped catless Downpipe (LH); 1 x Heat Wrapped catless Downpipe (RH); 1 x LH Connecting Pipe (To Milltek Sport System); 1 x RH Connecting Pipe (To Milltek Sport System); 1 x Downpipe fitting Kit for Non OPF Cars
- SSXAU909: 1 x Heat Wrapped 200CPSI HJS Cat Downpipe (LH); 1 x Heat Wrapped 200CPSI HJS Cat Downpipe (RH); 1 x LH Connecting Pipe (To Milltek Sport System); 1 x RH Connecting Pipe (To Milltek Sport System); 1 x Downpipe fitting Kit for Non OPF Cars
Catted and catless downpipes
A catted downpipe keeps a catalytic converter in the downpipe. A catless downpipe (de-cat) replaces it with a straight pipe. Each option name above says which one it is.
Fitment
Audi S8 D5 4.0 TFSI V8 Saloon / Sedan - Standard Wheel Base, 2020+. US-market model listing. Confirm your exact model, engine and options before ordering, and message us if you are not sure.
About Milltek Sport
- T304L stainless steel, CNC mandrel bent.
- Designed and developed in Derby, UK with a US facility in Knoxville, Tennessee, and tested at the Nürburgring.
- Company founded in 1983.
Warranty
Milltek covers most products with a lifetime guarantee. Downpipes, hi-flow catalysts and any part with valves are covered for 2 years or 80,000 km, and electronic products for 2 years. Claims go through the authorized dealer you bought from, and cover the original purchaser only. Full terms: millteksport.com/Warranty.html
Notes
- Catless downpipes and other cat bypass parts replace emissions equipment. They are sold for off-road and competition use where local law allows. You are responsible for checking the rules that apply to your vehicle.
- Fitting times are Milltek estimates for a professional installer.
Fitment
| Year | Make | Model |
|---|---|---|
| 2020–2026 | Audi | S8 |
Not sure? Text us your VIN and we’ll confirm.
Shipping & returns
Shipping: Orders ship via UPS, FedEx or USPS, from our facility near Los Angeles or directly from the manufacturer. Rates for many items are weight-based and shown at checkout. If you need it by a certain date, text us before you order.
Returns: Unused items in brand-new condition and original packaging can be returned within 30 days of the invoice date, with a 25% restocking fee unless otherwise specified. In some cases we can offer a lower fee with the balance as store credit. Shipping charges aren't refundable in either direction unless approved by AutoTalent.
Not returnable: special-order or custom items, and anything that has been installed, modified or altered.
Cancellations: free if the item is out of stock or we miss the ETA you agreed to. Other cancellations carry a 5% processing fee to cover card fees we can't recover. Special-order items can't be cancelled.
Damaged in transit? Report it to the carrier and to us within 48 hours, keep all packaging, and don't send anything back without our written approval.
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