Use a socket wrench 🔧 with a 10mm socket to remove these two bolts. Then look 👀 under it to see if the o-ring is in tact. See if it is still playable and it not dry rotted. Make sure you have an o-ring handy. You might just want to replace it anyways since you have it opened up. This is called your bypass valve. It sends air back into the intake pipe instead of venting it into the atmosphere. Which could potentially cause a rough idle or stall.