Description
Upgrade your Audi B9 S4 or S5 3.0T with the Integrated Engineering (IE) Performance Downpipe, engineered to deliver maximum horsepower and torque gains when paired with Stage 2 or hybrid turbo ECU software. Featuring a massive cast body, high-flow design, and precise OE-style fitment, this premium downpipe optimizes turbo response, increases exhaust flow, and delivers an aggressive motorsport-inspired sound—all without the harshness of traditional stainless systems.
Key Features:
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Supports Hybrid Turbo ECU Calibrations & Stage 2 Tuning
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Massive 6" Cast Downpipe Body → Dual 2.5" Stainless Steel Legs
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200 CPSI High-Flow Metal Matrix Catalytic Converter
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304 Investment Cast Stainless Downpipe with TIG-Welded Construction
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Thick-Wall Casting Minimizes Radiant Heat in Engine Bay
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Precision CNC Machined V-Band & Flange Connections
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Aggressive, Drone-Free Exhaust Note with Enhanced Turbo Sounds
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Direct Bolt-On Fit to Stock or IE Midpipes
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Dyno-Proven Gains: +45HP / +41TQ at the Wheels with Hybrid Turbo
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Catalytic Converter Warranty Available When Used with IE ECU Software
Aggressive Motorsport Sound – Without the Drone
IE’s cast construction eliminates the harsh, metallic "tinny" tones often found on all-stainless downpipes. Instead, you get a deep, rich, aggressive exhaust note that enhances both engine growl and turbo spool — all while maintaining comfort for daily driving with zero cabin drone.
Designed for a Perfect Fit
The B9 3.0T engine’s central-mounted turbo and hot-v configuration require a precisely engineered downpipe. IE uses advanced 3D scanning and in-house prototyping to design a perfectly fitting component that avoids rubbing, rattling, and clearance issues. Whether installing with the OEM exhaust or IE’s Midpipes, fitment is 100% bolt-on.
High-Flow 200 CPSI Catalyst
The included 200 CPSI high-performance catalytic converter offers a perfect balance between power and emissions. Positioned near the turbo for optimum effectiveness, this cat eliminates unpleasant smells, reduces rear bumper staining, and supports full Stage 2 and hybrid turbo power outputs.
Note: Catalytic converter warranty applies only when paired with IE ECU performance software.
Hybrid Turbo Compatible
Stock downpipes are restrictive and severely limit the performance of upgraded hybrid turbos. The IE Performance Downpipe is engineered to eliminate those restrictions, providing the free-flowing path needed for higher boost pressures, faster spool, and greater horsepower and torque. It's the ultimate foundation for your turbo upgrade build.
Dyno-Proven Results
Tested on a B9 S4 with a hybrid turbo in controlled dyno conditions, this IE downpipe delivered an impressive +45HP and +41FT-LBS at the wheels, proving its ability to support aggressive power builds without compromise.
Vehicle Fitment:
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Audi B9 S4 3.0T
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Audi B9 S5 3.0T
