When I take a turn in my 93 rx-7, I hear a thumping noise from the back suspension area. Its seems to only happen when the turn is taken a little quick. Nothing when I take slow turns. Any suggestions? Thanks!!

 

Sounds like a bushing is stuck and then piling loose when their is a load. I would check and grease them if necessary.

 

There aren't any OEM bushings in the rear of a FD that take grease.
Off-hand.....
*Use a flashlight and check the ENTIRE Power Plant Frame (PPF) really closely, and especially where it mates to the rear diff for cracks and make sure the bolts are tight.
* The differential bushings are fluid-filled. Look for any signs of leaking.
*Check the half-shafts. Maybe one binding up.
*Check the exhaust system closely and make sure it's secure and hangers aren't shot.
*There are six pillow-ball bushings in the rear suspension that can wear-out. When they do, even a little slop can produce big noises. Usually it's not just when you're turning though.