I briefly inspected and test drove this '01 white coupe VIN JH4NA21311T000062 over the weekend. It is in surpringly good condition cosmetically, just a couple minor issues. Mechanically it feels great. I was in a bit of a rush so I did not have it up on a lift or sit there looking over every square inch for every possible rock chip. I just looked it over for about 15-20 minutes, mainly looking for any obvious evidence of repair work, and then drove it for 10-15 miles. I didn't start taking things apart or checking fluids, etc.
The car has a K-40 front/rear radar system installed. LED indicators have been added to the gauge cluster and you can see the control mounted in the coin tray.
Everything else looks stock.
They said it was taken on a trade for a used 911 turbo they sold.
The 3.5L thing is just a mistake in their ad. They are a Porsche dealer and this is the first NSX they've ever had on the lot or even driven so give them a break. They are a reputable dealer and the car seems to be in good condition, which is all that really matters.
Anyone seriously interested in the car, please PM me and I'll go over the details and try to help you coordinate an in-depth mechanical and body inspection if you would like (the local Acura dealer should be avoided in my opinion).