Okay guys, I know that this issue has been brought up so many times before but I want to see how other MP3 are like. My MP3 makes that thumpity noise, like something is loose in the back and this happens whenever I run over a minor bump. What could this be. I took the car to Mazda for inspection of the noise, Mazda told me that there was nothing wrong, he did however told me that we have pretty stiff shocks and that may the cause of it. I'm not sure, but my previous car (honda civic B16B) even when lowered with tokico sounded fine. Could anyone give their opinions on this?