It is a real bite. The depreciation / value curves on the NSX are much different from the nominal data they use to determine policy on how old a car they'll finance. Also, just as an aside, it was my experience that the credit union was even LESS accomodating than the banks in this particular regard; the banks being willing to finance an older car than the credit union would - by at least a year.
I'll give you a wild idea which may not work, but did for me once, and if you're desperate it's at least worth a try. When I tried to finance my second NSX I ran into yet another problem: the banks' regulations made it practically impossible to finance an out-of-state car; one titled and being purchased in another state.
I called a good Acura dealer located in the city where the car I was buying was located, and spoke with their finance guy. Although this was a "private party" purchase, I was able to persuade the dealer to provide the financing on it. Technically, on paper, they had to take the car into their inventory to do it; essentially buying the car from the seller at the agreed price, then selling the car to me at that price. They of course had to inspect/certify the car, and all that rot. It all took place within an hour or so at the dealer when I flew back to pick up the car. As I recall the dealer got a couple of hundred for their efforts, which was fair. The financing was provided at an attractive rate through one of the banks they used. They did tell me that officially speaking, they weren't REALLY supposed to do things like that. They were however willing to do it in this case, and it really helped me out. Again it's a long shot, but if you're desperate....
Richard
'93 Blk/Blk