Nissan R33/RB25DET Billet Idle Air Control Valve (IACV)

Introducing the Outsider Garage Billet Idle Air control Valve for the Nissan RB25DET. Designed around the 3 bolt R33 IACV flange, this billet housing uses a common GM 4 pin Stepper motor that is easy to source and setup. We've also added 6AN ORB inlet threads so you can choose to use a hose fitting or an upgraded AN line. Flows approximately 20% more air than OEM. Why use a 4 pin Stepper vs the OE 2 pin? A 4-pin stepper idle air control (IAC) valve has more precise control over air flow compared to a 2-pin stepper IAC valve, as the additional pins allow for finer motor control with more "steps" per rotation, enabling smaller adjustments to the air intake, while a 2-pin stepper typically offers only basic open/closed positions for the valve. 4-pin stepper IAC valves are often found in modern vehicles that need precise idle speed control, while 2-pin stepper IAC valves might be used in older vehicles where less precise control is needed.  As you upgrade your RB further from stock, you m