4" Ultra Transparent NACA Duct

Ultra transparent and wind tunnel tested, our 4 inch NACA duct provides over 55% more airflow than standard 3 inch NACA ducts when used in conjunction with 4 inch tube ducting and a 4 inch plenums.

Our ultra-transparent injected molded plastic is far superior to that of the cloudy and flimsy vacuum formed NACA ducts found on most race cars. Our NACA's retain their shape at high speeds, guaranteeing superior performance at all speeds. While high pressure injection molding is more expensive than vac-formed, we are able to achieve a much stronger and better looking product for those who are seeking the ultimate look and performance. 

NACA ducts bring air into a vehicle with minimal increase in drag. The purpose of a NACA duct is to increase the flow rate of air through it while not disturbing the boundary layer. When the cross-sectional flow area of the duct is increased, you decrease the static pressure and make the duct into a vacuum cleaner, but without the drag effects of a plain scoop. The reason why the duct is narrow, then suddenly widens in a graceful arc is to increase the cross-sectional area slowly so that airflow doesn’t separate and cause turbulence and drag. 

• IMSA Compliant
• Lightweight
• Crystal Clear
• Heavy Duty