After I bought this car, the noise has become more and more prevalent. it started only in 4th gear but now it has moved to all gears in different levels of volume and intensity. sometimes the car will jerk letting off the throttle when it starts making the noise, and when it doesn't make the noise, it is a nice snooth decel. I changed oils, trans oil was fine, diff oil was dark. Some have upgraded to torsens and the issue was solved, but this sound is not coming from the rear. Drive shaft or PPF may be a culprit here too. I went ahead and ripped the center console out and the outer boot so I could hear better. It sounds like it is coming from in front of the shifter. Next step is to try and replace the clutch, though it feels fine it is the one I bought it with. There is heat shield rattle but it is a distinct tin rattle and I will remove them to see if I can take that sound out of the equation. I have had no luck and this sound seems to plague many mx-5 owners. I will try to keep a well documented video series trying to fix this problem and hopefully if I fix it it will help others in this situation.
