On mine you simply unplug the connector, remove four clips that hold it in the air inlet and install the new one. I am talking about the "air mass meter" that goes in the air inlet tube between the air filter housing and the intake manifold. I hope that's the part you guys are talking about. It is cylindrical, about six inches in diameter and shaped like a coffee can. I replaced one on my VW 4-cylinder, too; it was similar in size and price (and installation time).