Unitronic Performance Downpipe for B9 S4/S5 3.0TFSI

The Unitronic Performance Downpipe for the 2017+ S4® & S5® 3.0TFSI® EA839 (CWG) engine is a direct bolt-on upgrade, designed to optimally eliminate unwanted restrictions in the factory downpipe, reduce turbo lag and enhance the exhaust note. It utilizes a 6” 400cpsi ultra high output catalytic converter, designed in partnership with Unitronic, from our emissions partners at Global Emissions Systems Inc (GESi®).

Paired with Unitronic Stage 2 Performance Software and other supporting bolt-ons, this Performance Downpipe helps yield up to 467HP / 547LB-FT on the 3.0TFSI equipped B9 S4 and S5.

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• GESi 6” G-Sport Ultra High Output UHOX 400cpsi Catalytic Converter
• 6" to 4.5" post-cat transition with T304 Stainless Steel tubing
• TIG-welded construction
• OEM-style thermal isolation/heat shielding
• Factory catalyst placement for maximum efficiency
• Proper factory Oxygen Sensor placement maintained
• Direct bolt-on fitment
• Enhanced exhaust note
• Compatible with the factory cat-back exhaust system

• Unitronic Performance Downpipe Featuring a GESi 6” G-Sport Ultra High Output UHOX 400cpsi Catalytic Converter
• All required installation hardware and gaskets.

• Stage 2