I did a search and found this:
[Here's a quote from a post on a different RC site...
"I put the HRC (12 port) in mine and their was no difference in effect, until I added the HRC fuel regulator which kicked up the fuel pressure, which required a different map, which fixed the problem."
The 12 port's he's referencing are the newer 12-port injectors.]
So, are they a direct replacement? I read somewhere that they are not, but can't find anything definitive.
I read on a VFR site that VFRs can use later model injectors (they are 12 port), even that later model injectors are the same as Honda car injectors and can be had at auto parts stores.
I have 61k miles on my 2000, which I bought new and I'm not having any problems, but supposedly the new injectors are an improvement.