NA1 and NA2 are codes for the NSX models based on the engine in the car, and are also characters 4-6 in the VIN (vehicle identification number).
NA1 refers to all NSXs with the 3.0-liter engine, which consist of the '91-96 NSX with the five-speed manual, and all years ('91-05) NSX with the automatic.
NA2 refers to all NSXs with the 3.2-liter engine, which consist of the '97-05 NSX with the six-speed manual.
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