Valvetronic Designs
Valvetronic Audi B9 S4 / S5 Valved Sport Exhaust System
Valvetronic Audi B9 S4 / S5 Valved Sport Exhaust System
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Audi B9 S4 & S5 Valved Exhaust System
Full T304 Stainless Steel System with Electronic Valve Control
Overview
The Audi B9 S4 and S5, powered by the EA839 3.0L V6, have impressive performance potential—but the stock exhaust hides much of this engine’s true character. The Valvetronic Designs Full Valved Exhaust System unleashes its voice, delivering an aggressive, motorsport-inspired tone when desired, and stock-like refinement when needed.
Unlike typical setups requiring multiple components from different vendors, our system is engineered as a complete solution—from the OEM or aftermarket downpipe all the way to the exhaust tips. This single-package design eliminates the need for mixing and matching resonator sections or axle-backs from other brands, ensuring perfect fitment, seamless performance, and consistent sound quality.
With valves open, expect a bold exhaust note, pronounced overrun crackles, and a commanding presence. With valves closed, the car returns to quiet factory manners, with zero drone when paired with the OEM downpipe.
For those upgrading from the V8-powered B6 or B7 S4, our system delivers the level of engagement and emotional sound you’ve been missing—ensuring your B9 ownership experience is just as exciting.
Why It Works
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One-Piece System Design: Eliminates the need for mixing components from multiple vendors.
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Electronic Valve Control: Switch between aggressive and refined sound instantly.
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Mandrel-Bent Construction: Maximizes flow for improved throttle response and power.
Sound & Control
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Valves Open: Aggressive tone with rich midrange and sharp overrun crackles on deceleration.
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Valves Closed: Quiet, refined, and OEM-like for comfortable daily driving.
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No Drone: When paired with the OEM downpipe, cabin comfort is unaffected.
Construction & Options
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Material: T304 stainless steel for long-term durability and corrosion resistance.
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Weight Savings: 16.4 lb lighter than the OEM exhaust system.
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Craftsmanship: Precision TIG welds and mandrel bends for optimal flow and strength.
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Tips: Includes premium exhaust tips for a finished, performance-oriented look.
Fitment
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2017–2024 Audi S4 (B9)
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2018–2024 Audi S5 (B9)
Installation Notes
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Direct-fit for sedan models.
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Coupe models require modification to shorten the mid-section for proper fitment. Contact info@valvetronic.com for guidance.
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100% reversible—return to stock at any time.
What’s Included
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Full T304 stainless steel valved exhaust system
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Electronic exhaust valves with key fob remote system
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All necessary clamps and hardware
Specifications
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Tubing: Full mandrel-bent T304 stainless steel
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Valves: Electronic, remote-controlled
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Weight Savings: 16.4 lb lighter than OEM
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Finish: Brushed stainless steel
ECU tuning is the process of adjusting the engine control unit's software to enhance vehicle performance, efficiency, or fuel economy.
It can, depending on the manufacturer. Many warranties do not cover modifications like ECU tuning.
Use the highest octane fuel recommended for your specific tune to ensure optimal performance and safety.
Yes, a properly tuned car can be used daily, as long as the tune is tailored for reliable, everyday driving.
CPC (Central Powertrain Controller) and TCU (Transmission Control Unit) manage your vehicle's powertrain and transmission systems, respectively.
Map switching allows you to change between different tuning settings (maps) for varying driving conditions without having to retune the ECU.
Yes, if done by a professional using proper tools, ECU tuning is generally safe for your vehicle.
ECU tuning works by modifying the software that controls engine parameters like fuel mixture, ignition timing, and boost pressure to optimize performance.
The process of installing a tune depends on the vehicle’s make and model. Some tunes are installed by connecting a tuning device to your car’s OBD-II port and uploading the tuned software, others may require ECU unlock.
Stage 1 is for vehicles with no modifications, stage 2 is for vehicles with bolt-on upgrades or downpipes installed.
We offer post-installation support, troubleshooting, and guidance on using your tuning software and hardware.
Choose tuning software that is compatible with your vehicle, has good reviews, and suits your performance goals (e.g., reliability vs. max power).
