Description
Maximize the performance, sound, and tuning potential of your Audi B9 S4 or S5 3.0T with the IE ProCore Downpipe. Engineered for enthusiasts pushing beyond factory limitations, this high-performance downpipe features a large 6-inch 400CPSI catalytic converter and free-flowing design to support everything from Stage 2 tunes to full hybrid turbo setups—while maintaining emissions compliance and avoiding check engine lights.
The IE ProCore Catalyst uses a proprietary tri-core internal structure and a specialized precious metal coating applied via a molecular bonded wash process. This ensures emissions readiness, long-term durability, and consistent performance gains without compromising flow.
Whether you're after an improved exhaust note or building a high-power setup, this downpipe is the key to unlocking the full performance potential of your 3.0T engine.
Key Features:
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ProCore Catalyst with emissions-ready design (no check engine light)
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High-flow 6" 400CPSI catalytic converter for maximum power
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Hybrid turbo ready for high-boost and big-power builds
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Deep, aggressive exhaust tone under throttle
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T304L stainless steel construction with hand TIG-welded joints
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Investment cast body for smooth transitions and durability
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Direct bolt-on fitment with no cutting or welding required
ProCore Catalyst Advantage
IE’s ProCore Catalyst offers a performance-focused solution to emissions compliance. The tri-core internal structure is less restrictive than traditional high-cell-count cats, while the advanced coating process ensures full emissions readiness. This downpipe passes vehicle readiness monitors and avoids triggering check engine lights, even under high-performance conditions.
Engineered for Power and Turbo Upgrades
The factory downpipe becomes a major restriction when increasing boost or upgrading to a hybrid turbo. The IE ProCore Downpipe eliminates this bottleneck with a cast 6-inch body transitioning to dual 2.5-inch mandrel-bent pipes, enabling your turbocharger to spool faster and deliver full torque and horsepower gains. This downpipe is compatible with stock and aftermarket hybrid turbos, making it ideal for serious performance builds.
Proven Dyno Gains
Dyno testing on a hybrid-turbo-equipped B9 S4 confirmed significant performance improvements. The IE ProCore Downpipe delivered gains of 45 horsepower and 41 lb-ft of torque at the wheels, demonstrating its ability to handle demanding builds without limiting flow or reliability.
Precision Engineering and Manufacturing
Using advanced 3D scanning and CAD modeling, IE engineers created a downpipe that maximizes flow while maintaining a precise, factory-like fit. The use of T304L stainless steel, investment castings, and reinforced welds ensures leak-free performance and long-term durability. The downpipe is engineered to integrate with the factory engine cover and heat shield for a clean, OEM-style appearance.
Straightforward Installation
This is a true bolt-on upgrade with no cutting, welding, or permanent modifications required. Installation is simple with standard tools, and all factory components can be reinstalled for a seamless look.
Average installation time: 2 to 3 hours
