A boost fooler is a device that tricks your car's computer into thinking that there is less turbo boost pressure than there actually is. This can be used to prevent the computer from throwing a check engine light or going into limp mode. It can also be used to increase the amount of turbo boost pressure that your car produces.
To hook up a boost fooler, you will need to connect it between the pressure sensor and the computer. You will also need to set the desired amount of boost pressure on the device.