High-performance Polini Big Evolution air filter designed for carburetors with 48–50mm air connection.

 Dual-layer foam construction delivers superior airflow and enhanced cylinder filling for measurable power gains. The open-cell foam design maximizes intake area while maintaining filtration efficiency.

• Compatible with Keihin PWK (19–30mm)
• Dellorto VHST (24–28mm)
• Mikuni TM (28–33mm) carburetors. 

Rubber mounting sleeves compress slightly during installation, so measured carburetor diameter may exceed filter connector size — this is normal and ensures a secure fit.