Airaid U-Build-It - Silicone Reducer 4.0in to 3.5in x 2.5in - 9107

The AIRAID Silicone 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.

Air intake systems are a common first mod to many project cars. They are quick and simple to install while also enhancing the looks of your engine bay, the sounds of your engine, and the performance of your vehicle.

Air intake components consist of air filters, vacuum lines, and connectors used to complete your air intake setup.

We started with air filters, but our vision has grown broader. Pushing beyond the street, into new rugged frontiers, we are optimizing air intake across the entire spectrum of internal combustion. From powdery snow-slopes, sand dunes, mud bogs, drag strips and road trips; to finish lines everywhere, across every terrain, we power drivers and explorers to dream bigger, adventure further, and discover their full potential.