This piece of underbody trim is causing the noise that I can hear from the NSR at speed and over speed bumps.
I think its part 77642-17030.
From diagrams, I think its held in by 2 bolts.
The medial part is hanging down so I assume the bolt has been lost or the part fatigued to the point of failure. The remaining bolt next to the sill is very rusted. It looks like I could have some fun trying to get it out.
Some sites report it to be steel but I'm sure the under the car is plastic
I have mine off ready to refit.
There is a bracket bolted to the sill and then a bolt through the plastic cover into bracket, so you only need to undo the bolt into the sill. The other three fixings are plastic clips.
Not a great result today.
SO the sill bolt is rusted and probably just spinning in the socket (or the socket isn't getting purchase) but the bigger issue is that the centre crossbrace the previous owner installed means that the bolt on the bit in the middle of the car has nowhere to go. It looks like it was simply wedged in behind the bracing previously and, presumably, it has come out after they brace came off to fit new brake cables.
So today's bodge was to cable tie the end off the ground to at least stop the bloody noise its making!!