The AIRAID Reducer Coupler can be used in conjunction with other U-Build-It (UBI) intake components or any other custom automotive installation. One end of the coupler fits over a common 4 inch outside diameter air intake component or throttle body while the other end of the coupler fits over a common 3.5 inch outside diameter component. The 28 degree angle of this coupler provides a good solution where hood clearance is an issue. This AIRAID coupler is made with three layers of durable wrapped silicone with inner fabric support. Appropriately sized hose clamps are included for installation.