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 4-inch plenums.

Our ultra-transparent injection-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.

• Lightweight
• Crystal Clear
• Heavy Duty