The Spectre polished aluminum inline air box with air filter has a 4 inch inlet and outlet. This cylindrical air box has an outside diameter of 6.1 inches. It allows you to create a custom air intake that feeds the engine cool outside air for more power.

• Includes a low restriction performance air filter
• Polished aluminum inline air filter housing
• 4 inch inlet and outlet
• 4 inch inlet and outlet
• Replacement filter: HPR9831
• 6.1 inch outside diameter