Milltek Large Bore Lower Downpipe - Audi B8 S5 4.2 V8 - SSXAU223

The Milltek Large Bore Lower Downpipe is a post-catalyst pair engineered for Audi B8 S5 4.2 V8 manual transmission models. Direct factory fitment with OEM hangers; no modification required. This T304L stainless steel downpipe optimizes exhaust scavenging immediately after the secondary catalytic converters, delivering dyno-proven gains in mid-range torque and peak horsepower.

Constructed from mandrel-bent T304L stainless steel with a large 2.36" (60 mm) bore diameter, this system maximizes flow while maintaining structural integrity and longevity. Hand-finished construction throughout. Uses OE cats for full emissions compliance on street or track.

Technical Specifications

• Material: T304L stainless steel, mandrel-bent
• Bore diameter: 2.36" (60 mm)
• Fitment: Audi B8 S5 4.2 V8 manual transmission only
• Configuration: Post-catalyst lower downpipe pair
• Installation: Direct fitment, uses OEM mounting points

Forty years of performance exhaust development—Milltek downpipes are engineered in-house and tested for fitment precision and acoustic balance. This lower downpipe delivers the flow gains serious S5 drivers expect without compromise on reliability or fit.

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

Specifications

• Pipe diameter: 60mm (2.36")
• Fitting time: 2 to 3 hours, including removing the factory system

Fitment

• Audi > S5 > 4.2 V8 B8 Coupe (Manual Only) > 2007 to 2011

• 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.