Milltek Large Bore Downpipes with HJS Hi-Flow Cat - Audi B9 RS4 RS5 - SSXAU815

Milltek Large Bore Downpipes with HJS Hi-Flow Cat for the Audi B9 RS4 RS5

Engineered as a direct replacement for the factory downpipe, mandrel-bent throughout to maintain flow and fitted to the OE mounting points.

Key Features

• Premium Materials: T304Lstainless steel for durability and lasting corrosion resistance.
• Enhanced Performance: 3.00" (76.20mm) mandrel-bent pipework improves exhaust flow for sharper throttle response.
• Direct Fitment: engineered as a bolt-on replacement for the factory system.
• Race Use: intended for track and off-road use— check local regulations before road use.

Technical Specifications

• Pipe Diameter: 3.00" (76.20mm)
• Material: T304L Stainless Steel
• System Type: Large Bore Downpipes with HJS Hi-Flow Cat
• Fitting Time: 3.00 to 4.00 hours

Compatibility

• 2017 to 2023 RS5 B9 2.9 V6 Turbo Coupe
• 2019 and later RS5 B9.5 2.9 V6 Turbo Coupe

Why Choose Milltek?

Every system is precision-built to deliver the sound, flow, and quality that define the Milltek difference.

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

Specifications

• Pipe diameter: 76.2mm (3.00")
• Fitting time: 3 to 4 hours, including removing the factory system
• Off-road / competition use only. Not legal for use on public roads in the US.

Fitment

• Audi > RS5 > B9 2.9 V6 Turbo Coupe > 2017 to 2023
• Audi > RS5 > B9.5 2.9 V6 Turbo Coupe > 2019 and Later

• 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.