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Upgrade the Audi S5 3.0 V6 Turbo Sportback B9 (2017+) with a Milltek Sport cat-back exhaust. Milltek...
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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 |
|---|---|---|---|---|---|
| SSXAU651 | Non-Resonated (Louder) | Cerakote Black Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU650 | Non-Resonated (Louder) | Polished Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU655 | Non-Resonated (Louder) | Polished Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU659 | Non-Resonated (Louder) | Polished Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU658 | Non-Resonated (Louder) | Cerakote Black Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU652 | Non-Resonated (Louder) | Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU656 | Non-Resonated (Louder) | Cerakote Black Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU657 | Non-Resonated (Louder) | Titanium Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU653 | Non-Resonated (Louder) | Burnt Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU654 | Non-Resonated (Louder) | Burnt Titanium Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU724 | Non-Resonated (Louder) | Quad JET-100 Carbon | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU641 | Resonated (Quieter) | Cerakote Black Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU640 | Resonated (Quieter) | Polished Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU644 | Resonated (Quieter) | Polished Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU648 | Resonated (Quieter) | Polished Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU645 | Resonated (Quieter) | Cerakote Black Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU642 | Resonated (Quieter) | Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU649 | Resonated (Quieter) | Cerakote Black Quad Oval | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU646 | Resonated (Quieter) | Titanium Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU643 | Resonated (Quieter) | Burnt Titanium Quad GT-100 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU647 | Cat Back Resonated | Burnt Titanium Quad GT-90 | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
| SSXAU723 | Resonated (Quieter) | Quad JET-100 Carbon | 2.50" (63.50mm) | 1.00 to 1.50 hours | - |
What comes with each cat-back
- SSXAU651: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tips; Quad 100mm GT100
- SSXAU650: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tips; Quad 100mm GT100
- SSXAU655: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tip Assembly; Quad 90mm GT90
- SSXAU659: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Oval Tips
- SSXAU658: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tip Assembly; Quad 90mm GT90
- SSXAU652: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tips; Quad 100mm GT100
- SSXAU656: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Velvet Oval Tips
- SSXAU657: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tip Assembly; Quad 90mm GT90
- SSXAU653: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Burnt Titanium GT-100 Trims; Quad 100mm GT100
- SSXAU654: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x 90mm Burnt Titanium Trims; Quad 90mm GT90
- SSXAU724: 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 Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from 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
- SSXAU641: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tips; Quad 100mm GT100
- SSXAU640: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tips; Quad 100mm GT100
- SSXAU644: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Tip Assembly; Quad 90mm GT90
- SSXAU648: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Polished Oval Tips
- SSXAU645: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Tip Assembly; Quad 90mm GT90
- SSXAU642: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tips; Quad 100mm GT100
- SSXAU649: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Cerakote Black Velvet Oval Tips
- SSXAU646: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Titanium Tip Assembly; Quad 90mm GT90
- SSXAU643: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x Burnt Titanium GT-100 Trims; Quad 100mm GT100
- SSXAU647: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from OE system); 1 x LH Mounting Bracket; 1 x RH Mounting Bracket; 4 x 90mm Burnt Titanium Trims; Quad 90mm GT90
- SSXAU723: 1 x LH Lower Downpipe (LHD Cars Only); 1 x RH Lower Downpipe (Both LHD & RHD); 1 x Front Silencer; 1 x Connecting Pipe Assembly; 1 x LH Rear Silencer with Valve (Reuses motor from OE system); 1 x RH Rear Silencer with Valve (Reuses motor from 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.
If you have any fitment questions, please feel free to reach out to our team via the contact methods below. If you are contacting us for any order status updates, please give us a call, or email us. We are a lean operation bringing you the best shopping experience possible. We are working on your orders as quickly as we can. We thank you for your patience.
- Call:
- Please reach out to us at (310) 231-0292 for sales inquiries if you are in the United States, Canada, Mexico.
- Email:
- For more in-depth product questions, fitment questions, product inquiries please email our performance specialists at online@autotalent.com.
- All other inquiries:
- Please direct your inquiries to the chat functionality on our website.
Returns Policy
If a product is ordered and not wanted, the UNUSED item can be returned for a 25% restocking fee unless otherwise specified. In some cases, we may offer the ability to return the item to us for a lesser restocking fee and then keep the balance as a store credit. To return an item, it must be in brand new condition with original packaging.
We cannot accept a return on special ordered or custom items.
Shipping is non refundable in either direction unless approved by AutoTalent. All items wanting to be return MUST be reported within 30 days of the original invoice date. No items will be returnable after 30 days. All products shipped from the AutoTalent facility are shipped via FedEx, USPS, or USPS. Some packages shipped from the manufacturer may or may not require signatures for package release.
Special Order Items
Some items may be special order specifically for the customer’s vehicle. These items generally require a deposit or paid in full. Once this deposit amount is notified to the customer and they agree to order the special order item, the deposit becomes non-refundable. These special order items cannot be returned or resold. Cancellations are not allowed on special order parts.
AutoTalent DOES NOT REFUND SHIPPING CHARGES. If you modify, install, or alter the item in any form, we cannot accept it as a return. We will not cover any expenses related to the product or installation, and you may be required to purchase a replacement.
** All cancellations that are requested that are NOT due to items not being in stock or delayed by the manufacturer are subject to a 5% processing fee. When you place an order with us we pay credit card fees that are NOT returned back to us. We will absorb these fees if we do not have the item in stock OR if you agree to the original ETA and that ETA is NOT met. If you decide to cancel for any other reason you will not receive this 5% fee back
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based.
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