I have a pop sound in the rear when turning onto an incline ever since the car was new...
I have done almost all possible suspension mods including hotchkis swaybars, SPL end links, hks hipermax RS coilovers and still this pop sound happens. It seems to be coming only from the right side, could a bad bushing cause this pop sound? If so which bushing is most probably causing the noise?

 

I have the same issue in the front. It's the end links moving suddenly under extream load condition's with the pop sound that your hearing. I don't know if it's has to do with the Hotchkis bar that we both have, I know that I tightened the end links far more then the FSM says to and now after 2 weeks I'm hearing the pop under less strenious condition's more and more. I'm going to pull the end links loose of the bar and do what I can to make the mounting surface on the bar as "high grip" as I can, like wise to the bushings on the SPL end links and retorque.

 

I doubt its the end links, I have tried
OEM sway + OEM end links
OEM sway + SPL end links
hotchkis + OEM end links
hotchkis + SPL end links

None of these set ups will get rid of the noise.