There is this rattle coming from the front suspension, mostly the right side. It happens whenever it goes over a bump. A speed bump is too large, more like a patched spot or crack in the road will do it. It also creeks on the right side when I jacked up my RX-8 to check it out.

I put the car up and took the front right wheel off and check that everything was tightened. I tightened the nuts on the thing the sway bar attaches to and the top one wouldn't tighten all the way. Not sure if it's supposed to be like that.

I have Tanabe Sustec Pro 5 coilovers with TEAS dampener controller, Tanabe Sustec Pro sway bars, and Greddy strut braces.

Any ideas as to what it is?

 

You check the grease on the sway bars??
https://www.rx8club.com/series-i-trouble-shooting-95/something-owners-aftermarket-swaybars-might-want-lookout-65304/

 

sounds like the swaybar is loose, did you torque everything to spec?

If not I would buy a torque wrench, torque everything to spec and see what happens.