If your NSX doesn't have the OEM air compressor, this seems like a good alternative for $60.
It looks similar to the OEM compressor, but adds a tire pressure gauge on top and some extra plastic on the ends. I don't know if it will fit in the OEM space for the compressor in the trunk because it looks bigger. You could contact the vendor to get specs.
http://www.griotsgarage.com/catalog.jsp?&SKU=10299
For reference: OEM compressor:
It looks similar to the OEM compressor, but adds a tire pressure gauge on top and some extra plastic on the ends. I don't know if it will fit in the OEM space for the compressor in the trunk because it looks bigger. You could contact the vendor to get specs.
http://www.griotsgarage.com/catalog.jsp?&SKU=10299
For reference: OEM compressor: