i have a 90 gt and it had a smog pump. I just took it off and pluged all the lines that ran to it. theres a steal hose that runs from the back of my heads to it and a line to the H pipe. i Bought that plugs for the heads on ebay. there made by trickflow. And the other line to the H pipe was welded off on my o/r one so i had nothing to worry about. when i Put my o/r h pipe on i never put these mil eliminators on and i dont have a check engine light or ne thing is it fine to not have em if that light isnt going on?