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Milltek Sport downpipe and connecting pipework for 2019+ Audi S5 3.0 V6 Turbo Sportback B9 (part SSXAU674), product photo

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Milltek Sport downpipe and connecting pipework for 2019+ Audi S5 3.0 V6 Turbo Sportback B9 (part SSXAU673), product photo

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Milltek Sport downpipe and connecting pipework for 2019+ Audi S5 3.0 V6 Turbo Sportback B9 (part SSXAU673), product photo (photo 2)

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Milltek Sport downpipe and connecting pipework for 2019+ Audi S5 3.0 V6 Turbo Sportback B9 (part SSXAU673), product photo (photo 3)

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Milltek Sport downpipe and connecting pipework for 2019+ Audi S5 3.0 V6 Turbo Sportback B9 (part SSXAU673), product photo (photo 4)

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Milltek Sport Catted Downpipes - 2019+ Audi S5 3.0 V6 Turbo Sportback B9

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Regular price: $885.00
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Milltek Sport Catted Downpipes - 2019+ Audi S5 3.0 V6 Turbo Sportback B9

Subtotal: $885.00

Not sure it fits? Text us your VINSee all fitment

Vendor: Milltek Sport

SKU: SSXAU674

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Overview

Milltek Sport catted downpipes, cat pipes and front pipes for the Audi S5 3.0 V6 Turbo Sportback B9 (2019+). These parts open up the hot side of the exhaust, cut backpressure and sharpen throttle response. Pick the option that matches your exhaust: some are built to fit a Milltek cat-back, others bolt to the stock cat-back.

Compare every part number

Part #	Option	Fits with (Milltek)	Stage 2 ECU remap	Race/Track only	Pipe size	Fit time
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)	1.00 to 1.50 hours
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)	1.00 to 1.50 hours

"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 part number

SSXAU674 (Cat Replacement Pipe): 1 x Cat Bypass Assmbly
SSXAU673 (Hi-Flow Sports Catted Downpipe): 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, 2019+. US-market model listing. Confirm your exact model, engine and options before ordering.

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
2019–2026	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.

Reviews & questions