SOS SWAY BAR GRINDING NOISE?

2010 g37x sedan here.

Recently I had a local shop install a used Nismo 370z rear sway (30k miles). Me being a total potato and new to modding didn't thing to get replacement endlinks and bushings, and the old ones were used. After install, I immediately felt bad grinding from the driver's side rear left arwa (I think) when ever turning right at all. Since this happened immediately after install I figure it was attributed to the new sway install without new hardware and went to remedy the issue. I ordered some new OEM bushings and used nismo 370z rear sway bar endlinks to install. I just installed them and the problem is slightly better, but still there and still apparent. I'm going back to the shop this weekend for a transmission fluid change and planning bringing this issue up (since my remedy didn't work). My thinking is I need to get beefier endlinks to support the stiffer sway.

Another thinking is the thicker sway bar could be interfering with my exhaust? I currently have test pipes, stock resonators and the hks hi power axel back. However my left muffler seems to sit a little lower and off center. I also get an exhaust rattle from the rear when stopped in drive. Could the thicker sway somehow be interfering with the exhaust? (When the sway was installed they had to drop the exhaust and the hangers may have been messed up during that) Has anybody had similar issues or anything that to reccomend? Thanks! (Pictured the old endlinks, you can see one was bent slightly)

Old Endlinks

 

I read the first few sentences and made the assumption that the bar is rubbing on your exhaust. Or they displaced something else that's rubbing on your exhaust.

All the other stuff you yourself typed points toward the exhaust. A swaybar with 30K miles doesn't need new bushing or endlinks. If your endlinks were fine before, they're fine now unless someone damaged them.

Check the exhaust. See if you can find what its rubbing on (check for marks).