You will need a 12mm socket. One of the bolts cross threaded as I put it back in and I had to "tap" it. Otherwise it would have taken about 10 minutes. It came with a new gasket and no need to put any glue, or stickem on it. Just line it up and put the bolts back in. Very VERY easy job. Cleaining it out may cost less, but will require more time. I changed it cause I kept getting the check engine light associated with it.
EGR = Emission Gas Return (I think)