I think the thing with the cat clamp is that it isn't inpenetrable but would make it much more difficult thus not worth the theif's time. Hoepfully they would simply move onto another vehicle without one.
not as good as BG but still works well. Only Seafoam it if u know what u r doing. Heard of other people hydrolocking their motors and destroying a piston or rod
Not the air box. Take off the tubing from the box to the throttle on the upper intake. Open the throttle and spray some throttle body cleaner in there. Use a small brush if you have one. Wouldn't hurt to start the truck and spray some in there too. It will try to die, but keep it running by...