Prior to my first auto-x, I installed the whiteline adjustable rear anti-swaybar (furthermore known as ASB). After taking my four runs, with the ASB set on the lowest setting, I drove to McDonalds for lunch. Occasionally my passenger (InFeK) noticed that the rear end made a thumping noise.

I noticed it too for a dew days, and then it disappeared.

Prior to the last Auto-X I added a front ASB and endlinks and increased the rear to the highest setting.

Result: No more thumping.
Question: What was the thumping?
It happened as I was coming out of the corners and the cars' weight shifted back center.

-Thanks

 

I have heard before on the forums that the bolts for the rear links are slightly smaller than the holes and will make a clunk noise if the work loose

just an idea

 

Thanks for the response. It's better now, and I just got back from another Auto-X and no more noise. I was just kind of curious.