Yonristic Performance Audi B9 A4 / A5 (Coupe & Sportback) Performance Valved Sport Exhaust System

The Yonristic Performance Valved Sport Exhaust System for the Audi B9 A4 and A5 (2017–2023, Coupe, Sportback, Sedan & Cabriolet) is a precision-engineered upgrade designed to transform the refined but restrained character of Audi’s EA888 2.0T platform into a more engaging, responsive, and emotionally expressive driving experience.

Built for drivers who want a balance of daily comfort and dynamic performance sound, this system enhances the factory exhaust architecture with a high-flow mandrel-bent stainless steel layout, a tuned resonator section, and a dual-valve control system that allows complete adjustment of exhaust behavior on demand.

At the core of the system is a high-performance center resonator, engineered specifically to reduce unwanted drone while enhancing low-frequency depth and turbocharged character. Unlike restrictive OEM designs that prioritize sound suppression, this resonator maintains cabin comfort while allowing a richer and more natural exhaust tone to develop under load.

Exhaust gases then flow into a Y-pipe split configuration, distributing flow evenly into dual rear valved mufflers. This layout improves exhaust balance and supports smoother gas evacuation, contributing to sharper throttle response and improved turbo efficiency.

The system’s electronically controlled valved mufflers provide dual-mode operation for full driving flexibility. In closed mode, the exhaust maintains a refined, OEM-like character suitable for commuting, highway travel, and residential environments. When opened, the system transitions into a deeper, more aggressive tone that highlights turbo spool, enhances throttle response acoustics, and introduces sharper overrun and shift character for a more performance-focused driving experience.

Constructed from T304 mandrel-bent stainless steel, the system is fully hand TIG-welded for durability, precision fitment, and long-term corrosion resistance. The design maintains optimal exhaust velocity through a 2.75-inch piping architecture, ensuring consistent flow performance without compromising drivability or efficiency.

This exhaust system is engineered as a direct bolt-on upgrade, requiring no cutting, welding, or ECU tuning. It integrates seamlessly with OEM mounting points and supports both factory and aftermarket exhaust tips for flexible styling options.

The result is a refined yet noticeably more expressive exhaust system that enhances the Audi B9 A4 and A5 driving experience—preserving German luxury while unlocking a more emotional and engaging sound profile.

Key Features

• Compatible with Audi B9 A4 (Sedan & Allroad) 2017–2023
• Compatible with Audi B9 A5 (Coupe, Sportback, Cabriolet) 2018–2023
• High-flow tuned center resonator for drone reduction and tone enhancement
• Y-pipe dual exit layout for optimized exhaust balance
• Dual electronically controlled valved mufflers
• Switchable quiet and aggressive sound modes
• Mandrel-bent T304 stainless steel construction
• Hand TIG-welded for durability and precision
• 2.75-inch optimized exhaust piping for flow efficiency
• Direct bolt-on installation using OEM mounting points
• Compatible with factory and aftermarket exhaust tips
• No cutting, welding, or ECU tuning required

Performance Highlights (Estimated)

• Improved throttle response and turbo spool efficiency
• Enhanced exhaust flow with reduced restriction
• More pronounced turbo and overrun sound characteristics
• Balanced increase in exhaust volume without cabin discomfort