Milltek Hi-Flow Sports Cat Downpipe - Audi - SSXAU587

High-flow primary downpipe with integrated sports catalyst and turbo elbow, engineered to reduce backpressure and improve turbo spool response. The lower-density sports catalyst allows exhaust gases to flow more effectively than OEM, while the wide-diameter turbo outlet accelerates boost delivery and throttle response. Direct OEM fitment; compatible with both Milltek and OE cat-back systems.

Technical Specification:

• T304L stainless steel construction, mandrel-bent primary pipe
• Hi-Flow sports catalyst with low restriction core
• Integrated turbo elbow for optimized turbo connection
• Stage 2+ ECU remap required for full calibration
• OEM hangers and fitment points preserved

Milltek downpipes are engineered for forced-induction platforms where boost response and mid-range spool are critical. This system pairs seamlessly with Milltek cat-back configurations or factory rear sections, making it an ideal foundation for incremental turbo upgrades.

Fits Milltek Cat-Back.

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

Specifications

• Pipe diameter: 76.2mm (3.00")
• Off-road / competition use only. Not legal for use on public roads in the US.

• 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.