are you looking at the wheel arches? the rear arch is cut a bit lower than the front, so it can look as tho the a** is sagging. look along the sill, see if thats level.

My EF sits slightly lower at the back with King superlows and Monroe GT Gas as well. I'veen other EF/EL's with the exact same combo sit at different heights as well.

EF/EL's have slightly lower rear wheel arches and a big rear end compared to the front, it gives the impression the car is slightly lower at the back, even if it isn't.

it may seem lower in the front/rear depending on where your 'measuring' from.. some cars the guards sit lower on the rear than the front and some are the opposite