I am recent owner of 6speed rx8, Is anyone experience low rpm like 650rpm with vibration in neutral. I have 1500 mile and everything else is good other than finding out that the ecu needs to be reflashed and a new oil pan. I also notice a change in sound when leting the clutch out after placing it in neutral.

please help

The noise you hear when you let out the clutch is the throw out bearring and it's normal. Do a search.