Hi, I am no expert..but...u have a unibody that is flexing ..your sheet metal floor is the frame!!...there is no frame...rust is killing the floor area....U.S.Car Tool has frame connecters for about $160.00/pair...your new floor will weld perfectly to these rails....stiffins up the car unbelievable and NO more oil canning when you step onto the floor in the car...when you lift the car to weld keep opening your doors carefully..the door gaps will change...when they are perfect gaps WELD!!!...they are made of much heavier steel than the OEM...depending on your welder guy each one takes about 1 hour to do....minimal grinding may be necessary...well worth the $ and time!!!
