Just a fyi those are not hooker headers. Hooker headers have a fixed or welded in place collector flange. Those headers are most likely flowtech or dynamax headers. All 3 look identical except for the hookers having a fixed flange. As previously stated you have to put headers in from bottom side of car. Removing starter and oil filter will help along with removing one motor mount bolt at a time and jacking that side of motor up helps alot. Usually one header will go in without major issues.
