Also in the same clunky boat. I replaced my rear sway bar last year (with the Cobb) and exchanged tighter handling for a squeaky bed sound. Nothing jacking up the volume can't solve. As for the front clunk, that's far more annoying. I had all the struts replaced so it's definitely the bushings. Question is, I hear replacing the front sway bar is a royal b****. (which is why I didn't go for it when I had the rear replaced) Now that the front bushings need to be replaced, should I just get the sway bar too? I'd hate to pay a shop a fortune just to replaced bushings. Either way, glad to have found the solution. Thought my MSP was the only mazda with clunk issues.