Description
The Unitronic Performance Downpipe for Audi B9 S4 & S5 3.0 TFSI (2017+) is a precision-engineered, direct bolt-on upgrade designed to unleash the full potential of the EA839 engine. By replacing the restrictive factory downpipe, this system reduces turbo lag, improves throttle response, and delivers a deeper, more aggressive exhaust note.
At the heart of this downpipe is a 6-inch GESi G-Sport Ultra High Output UHOX 400cpsi catalytic converter, developed in collaboration with emissions specialists at Global Emissions Systems Inc. (GESi). Rated for up to 1200 horsepower, it ensures maximum flow, durability, and compliance with emissions standards.
Constructed from T304 stainless steel with TIG-welded seams, OEM-style thermal shielding, and factory oxygen sensor placement, the Unitronic Downpipe guarantees optimal performance without sacrificing reliability. The smooth 6-inch to 4.5-inch transition provides exceptional exhaust gas flow, while maintaining compatibility with the factory cat-back system for a true plug-and-play fitment.
When paired with Unitronic Stage 2 ECU Performance Software and supporting upgrades, this downpipe enables output of up to 467 HP and 547 lb-ft of torque, transforming the driving experience of the Audi B9 S4 and S5.
Key Features:
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GESi 6" G-Sport Ultra High Output UHOX 400cpsi catalytic converter
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6" to 4.5" stainless steel transition for maximum flow
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OEM-style heat shielding for reduced engine bay temperatures
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TIG-welded T304 stainless steel construction
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Proper factory O₂ sensor placement maintained
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Direct bolt-on fitment with OEM cat-back compatibility
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Enhanced exhaust tone with reduced turbo lag
What’s Included:
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Unitronic Performance Downpipe with GESi 6" UHOX Catalytic Converter
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All required installation hardware and gaskets
Required Software: Unitronic Stage 2
Engineered with precision and tested to meet or exceed compliance standards, the Unitronic Performance Downpipe delivers the perfect balance of power, sound, and reliability for Audi enthusiasts.
