The NOX Noise Filter D.23mm Silver/Black is a compact, high-quality intake silencer designed to reduce induction noise on modern direct-drive kart engines without compromising airflow or throttle response.

With a 23mm inlet diameter, this NOX filter is commonly used on OK and OKJ engines, as well as other applications requiring a 23mm intake connection. Its internal noise-reducing design helps meet circuit sound limits while maintaining consistent engine performance across a wide range of conditions.

Manufactured using durable materials and finished in a clean silver and black design, the NOX filter offers excellent reliability and easy fitment, making it ideal for both race and test use.