Milltek Large Bore Downpipe - Audi B9 A4 2.0 Quattro - SSXAU744

The Milltek Large Bore Downpipe with Hi-Flow Sports Catalyst is engineered for the Audi B9 A4 2.0 Quattro Saloon and Avant. This direct-fit component optimizes exhaust flow from the turbocharged engine to the cat-back system, delivering measurable gains in horsepower and torque while maintaining emissions compliance.

Constructed from T304L stainless steel with mandrel-bent 3" (76.2 mm) piping, the downpipe features a high-flow sports catalyst rated at 200 CPSI (cells per square inch). Hand-finished construction ensures OEM+ fitment with existing Audi factory or Milltek cat-back exhaust systems. Requires Stage 2 ECU software for optimal performance mapping.

Fitment & Compatibility

• 2017+ Audi B9 A4 Saloon (2.0 TFSI EA888)
• 2017+ Audi B9 A4 Avant (2.0 TFSI EA888)
• Quattro and FWD variants
• Direct fit to OEM or Milltek cat-back exhaust
• No modifications required

Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

Specifications

• Fitting time: 2 to 2.5 hours, including removing the factory system
• Off-road / competition use only. Not legal for use on public roads in the US.

Fitment

• Audi > A4 > 2.0 TFSI B9 Quattro Saloon & Avant > 2016 to 2023

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.