suspension knock

[Purcell1]

hey guys,
i recently purchased an s13. Im having a really loud knocking noise, everytime i got over a bump in the road. It sounds like its coming from the rear coilovers, but its very hard to tell. Could it be the coils bottoming out?

Stance GR + Pros coilovers
- Full energy bushing kit
- GTR rear sway bar
- Bings Solid subframe bushings
- PBM TC rods
- Tein tie rods
- GTR Brakes Front and rear

[Promise Land]

Could be them bottoming out or you could have the preload too high that it pops when they compress and return. Do you know they are set at?

[marcobleedsblue]

Is the nut on the top of them loose?