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I got mine loose with just the extensions with a 1/2 ratchet. Had to really pull on them hard. Thought my 3/8 extensions were gonna snap...then when they let loose, I busted my knuckles! Wet them down with WD40 before I started. My left hand was swollen for a few days from cramming it up past the passenger side pipe to plug the o2 plugs back together.