Calibear Spinning Carb Cap
This Spinning Carb Cap does everything you want as a carb cap, and then some. It's designed to fit a wide variety of bangers and feels high quality when in use. There's a large carb hole on the top which gives you complete control of the airflow.
There are slits in the side of the cap that allows for some serious airflow at a specific angle that will spin around in your banger. This cap is the best we've come across if you want to pair it up with a terp pearl. You're going to love this cap.