Milltek Large Bore Downpipe HJS Hi-Flow Sports Catalyst - NO CEL - VW Golf MK8 R / Audi S3 8Y - SSXVW673

The Milltek Large Bore Downpipe with integrated Hi-Flow Sports Cat is a direct-fit turbo-back component for the VW Golf MK8 R and Audi S3 8Y. This T304L stainless steel system pairs seamlessly with OEM or Milltek cat-back exhausts, eliminating the factory restriction and unlocking dyno-proven performance gains.

Engineered with a 3-inch (76.2 mm) mandrel-bent main pipe and 200 CPSI high-flow catalytic converter, the downpipe optimizes exhaust scavenging to reduce backpressure. CNC-formed construction ensures precise fitment using OEM hangers and mounting points—no modification required. T304L stainless steel construction resists thermal stress and corrosion, finished to Milltek's hand-specification standard.

Fitment

• VW Golf MK8 R (EA888 Gen4)
• Audi S3 8Y (EA888 Gen4)
• Compatible with OEM cat-back or Milltek Signature Series systems
• Uses factory hangers and heat shield provisions

This downpipe delivers measurable efficiency without compromise to durability or daily-driver compliance.

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

Specifications

• Pipe diameter: 94mm (3.70")
• 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 > S3 > 2.0TFSI Quattro Saloon/Sedan 8Y > 2022 and Later
• Volkswagen > Golf > MK8 R 2.0 TSI > 2022 to 2024
• Volkswagen > Golf > MK8.5 R > 2025 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.