Your BOV is a Prof (Sheepdog). Very JDM. That same kit was on my SR clip. the stock recirculating valve is plugged and that pipe replaces a section of the stock IC set-up for a DIY atmospheric BOV conversion. I’m running it with my FMIC. I like the sound - not loud or high pitched. I had to polish and lube the sliding parts to get it working right (very easy to do).