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Vendor:
Milltek Sport
SKU:
SSXAU701
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Overview
Upgrade the Audi S5 3.0 V6 Turbo Sportback B9 (2017+) 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 |
|---|---|---|---|---|---|
| SSXAU701 | Non-Resonated (Louder) | Cerakote Black Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU700 | Non-Resonated (Louder) | Polished Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU704 | Non-Resonated (Louder) | Polished Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU702 | Non-Resonated (Louder) | Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU705 | Non-Resonated (Louder) | Cerakote Black Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU703 | Non-Resonated (Louder) | Burnt Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU722 | Non-Resonated (Louder) | Quad JET-100 Carbon | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU695 | Resonated (Quieter) | Cerakote Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU694 | Resonated (Quieter) | Polished Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU698 | Resonated (Quieter) | Polished Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU696 | Resonated (Quieter) | Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU699 | Resonated (Quieter) | Cerakote Black Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU697 | Resonated (Quieter) | Burnt Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU721 | Resonated (Quieter) | Quad JET-100 Carbon | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
What comes with each cat-back
- SSXAU701: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tips; Quad 100mm GT100
- SSXAU700: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tips; Quad 100mm GT100
- SSXAU704: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Oval Tips
- SSXAU702: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tips; Quad 100mm GT100
- SSXAU705: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Velvet Oval Tips
- SSXAU703: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Burnt Titanium GT-100 Trims; Quad 100mm GT100
- SSXAU722: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x LH Front Silencer Rep Pipe; 1 x RH Front Silencer Rep Pipe; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Carbon Jet-100 Trims (To Fit 63.5mm OD Outlets); 102 Jet
- SSXAU695: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tips; Quad 100mm GT100
- SSXAU694: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tips; Quad 100mm GT100
- SSXAU698: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Oval Tips
- SSXAU696: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tips; Quad 100mm GT100
- SSXAU699: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Velvet Oval Tips
- SSXAU697: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Burnt Titanium GT-100 Trims; Quad 100mm GT100
- SSXAU721: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembley; 1 x LH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x RH Rear Silencer with Valve (Re-uses Valve Motor from the OE System); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Carbon Jet-100 Trims (To Fit 63.5mm OD Outlets); 102 Jet
Downpipe options: compare every part number
| Part # | Option | Fits with (Milltek) | Stage 2 ECU remap | Race/Track only | Pipe size |
|---|---|---|---|---|---|
| SSXAU674 | Cat Replacement Pipe: Cat Bypass, fits with OE and Milltek Sport Cat back Systems | Cat Bypass, fits with OE and Milltek Sport Cat back Systems | - | Yes | 2.50" (63.50mm) |
| SSXAU673 | Catted Downpipe (Race/Track only): 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems | 200 Cell HJS High Flow Sport Cat, fits with OE and Milltek Sport Cat back Systems | - | Yes | 2.50" (63.50mm) |
"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
- SSXAU674: 1 x Cat Bypass Assmbly
- SSXAU673: 1 x High Flow Cat Assembly
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 S5 3.0 V6 Turbo Sportback B9, 2017+. 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 |
|---|---|---|
| 2017–2026 | Audi | S5 Sportback |
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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