Milltek Audi B9 RS4 and RS5 Large Bore Downpipes with Hi Flow Cats
Upgrade your Audi RS4 B9 or Audi RS5 B9 with Milltek Sport large-bore 76 mm downpipes with high flow sports cats. These performance downpipes are engineered for the 2.9 TFSI V6 twin-turbo engine and are the go-to Audi RS4 downpipes and Audi RS5 downpipes for drivers chasing flow, response and sound. Featuring HJS 200 cell high flow catalysts and a durable semi-gloss black Cerakote coating, this Milltek B9 downpipe upgrade reduces back pressure, improves exhaust gas flow and unlocks the full potential of a Stage 2 tuned RS model when paired with a Milltek cat-back exhaust.
As a UK Milltek specialist, Nforcd has fitted and run these on customer cars with fantastic results. Expect quicker spool, a stronger mid-range and a deeper, motorsport-inspired tone when combined with the Milltek cat-back. If you are searching for Audi RS4 B9 downpipes with cats, Audi RS5 B9 catted downpipes, Milltek RS4 downpipe upgrade or RS5 performance exhaust parts, this is the proven choice.
Key benefits
- Large-bore 3 inch, 76.20 mm downpipes for maximum flow on the 2.9 TFSI V6
- HJS 200 cell high flow sports catalysts for performance with quality and durability
- Semi-gloss black Cerakote coating for heat management and corrosion resistance
- Designed for highly tuned cars and Stage 2 ECU remaps
- Transforms response and sound when used with a Milltek Sport cat-back exhaust
- Precision UK engineering from Milltek Sport
Features and specification
- Pipe diameter: 3.00 inch, 76.20 mm
- HJS high flow sports cats, 200 cell
- Ultra-durable semi-gloss black Cerakote coating
- Left and right downpipes with heat wrap protection
- Must be fitted with a Milltek Sport cat-back system
- Requires a Stage 2 ECU remap
- For Non-OPF, Non-GPF models
What is included
- 1 x LH downpipe with heat wrap protection
- 1 x RH downpipe with heat wrap protection
Vehicle compatibility
- Audi RS4 B9 2.9 V6 Turbo Avant Non-OPF, Non-GPF 2018
- Audi RS5 B9 2.9 V6 Turbo Coupe Non-OPF, Non-GPF 2017 to 2018
- Audi RS5 B9 2.9 V6 Turbo Sportback Non-OPF, Non-GPF 2019 and later
Part number
SSXAU815
Compatibility check
We will run a compatibility check before dispatch. Provide your UK registration or the last 7 digits of your VIN at checkout so we can confirm the part fits your car.
Fitting and support
Professional fitting available at Nforcd in Warwickshire. To arrange installation or request a quote, email Sales@nforcd.com. Our team are happy to advise on RS4 B9 downpipes, RS5 B9 downpipes, Stage 2 tuning and Milltek cat-back combinations.
About Milltek Sport
Designed and manufactured in the UK, Milltek Sport has over 32 years of exhaust engineering expertise. From Audi and Volkswagen to Porsche, BMW and Bentley, Milltek products are developed with input from road and motorsport programmes to deliver performance, quality and sound you can trust.