The NOX Noise Filter D.23mm Red/Black is designed to effectively reduce intake noise on direct-drive kart engines while preserving smooth airflow and reliable throttle response.

Featuring a 23mm inlet diameter, this NOX intake silencer is widely used on OK and OKJ engines, as well as other kart engines requiring a 23mm intake connection. Its compact internal design helps manage induction noise to comply with circuit sound regulations without negatively affecting engine performance.

Finished in a distinctive red and black colour scheme, the NOX filter combines durability, performance, and easy installation, making it a popular choice for competitive karting environments.