I don't know if it's related or not. I also have the SPEC2 and when at idle with the clutch out I sometimes get a chattering. Push the pedal in and it stops, let out sometimes chatter sometimes silent. Car drive fine.

RVM Short Shifter RVM Intake Pipe Full Kenwood System NX Neons "If you can read this, thank a teacher; If you are reading this in english, thank a soldier"