Airaid U-Build-It - Silicone Reducer Coupler 4in. ID x 4-5/16in. x 4in. L.

The AIRAID Reducer Coupler connects two air intake tubes of different diameters. Use of this component with other AIRAID couplers, tubes and related U-Build-It components allows you to design your very own custom performance air intake system. The AIRAID Reducer Coupler connects two air intake tubes of different diameters.