09D Volume Reduction Chamber [Focus RS Mk3]

<p>As airflow and power output is increased, the majority of Mk3 Focus RS exhibit a high-pitched whistling noise - most noticeable on cold start and with light throttle applications. <br></p> <p>The ZERO<strong>NINE Design</strong> volume reduction chamber replaces the OE turbo resonator and has been engineered to suppress the acoustic frequencies being generated across the turbocharger compressor housing - think of it like noise cancelling headphones for your turbocharger.</p> <p>Despite its simple appearance, the VRC's dimensions, the materials used and internal configuration all play a crucial role in cancelling out this unwanted NVH (Noise / Vibration / Harshness).<br></p>