seems to me, if you have a lift overhead it would be easier to swap DPs as opposed to going in from the top. UP - remove dust-cover, 2 - O2 sensor probes, 2 bolts on bracket, support on exh. pipe, & 2 end-clamps. reverse to replace & plug in O2 sensors when it hits the ground. DOWN - pull WS wipers, all the cowling & assorted activities like removing rubber strip, THEN do all the before-mentioned activities. . PROVE ME WRONG.