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Audi S4 B9 Active Valve Sport Exhaust (2017 on)

Excluding GST |
A lighter weight system that has more efficient flow and shows a noticeable improvement in throttle response whilst enhancing that sports car sound. 
The system is designed to work with the engine, so at lower revs the sound remains relatively civilised and at higher revs it provides more presence and volume. 
QuickSilver's Sound Architect exhaust system contains two separate gas paths and an electronic flap-valve decides which path is taken, loud or quiet. This valve is controlled by the QuickSilver APP on the driver's telephone or (in many cases) integrated into the car's existing controls, the Porsche GT3 and Audi R8 are fully integrated. In creating their system QuickSilver analyse the sound of the modern car to determine which elements should be suppressed and which enhanced. �The valved QuickSilver Sound Architect systems are truly 'plug & play'. The electronic module simply connects to an existing accessory socket and is controlled wirelessly - so there in no intrusion into any of the car's existing systems and no re-wiring is necessary. It could not be simpler. The electronics are designed in-house and manufactured for us here in the UK, using local British factories. 
- Wonderful deep muscle rich sound. 
- Stainless Steel mandrel bent tubing. 
- Improved throttle response. 
- Retains original tips to keep the look. 
 Secondary Cat Replacement pipes for RHD and LHD models
Helmholtz resonator
Sound Architect Valve Control
Dedicated mobile app to switch the sound
4. 5KG weight saving
90 and 100mm genuine carbon tips
76mm T304 stainless Tube on the loud side
68mm tube on the quiet side