I went to see this car about two weeks ago and drove it as well. The car is reasonably clean but had quite a few vibrations coming from the engine compartment area when accelerating on the road. Far more than an NSX w/ less than 20,000 miles should have. I then inspected the vehicle after the drive and noticed all the bolts for the driver's side rear quarter panel had been removed at some point. The paint was removed from all the bolt heads. I believe there was a recall back in '99 for creaking coming from the rear quarter panel, but who knows if that is why this panel was removed. In my opinion, I would never consider a used NSX where a panel had been taken off unless it could be truly documented why. I hope this helps.