I’ve purchased the EGR and CCV deletes as well as the upgraded intake manifold, upper radiator hose and thermostat block, and compressed air piping. Overall I am very satisfied with the quality and fit of all of the parts. Some of the instructions could use a little more detail, but if you are in any way mechanically inclined, you’ll be able to do these yourself no problem. I did have to make a very small modification to the aluminum quick connector on the upper radiator hose in order to get it to lock in place, but other than that everything has been great!