I'm currently looking for a medium npr core. I believe it is the same one colonelfox used. I've searched and read the threads about it and couldnt find one that listed the models and years that the IC was used. So i'm looking for that information.

If anyone knows of a source for them at a good price, Pm me, please. Thanks, Aero

Since you've read all the threads, I imagine you've seen my replies, so I won't repeat.
I tried researching what years/engines etc. they came on, but with no luck. There doesn't seem to be a whole lot of info about where they came from, except the afformentioned. I don't know any places to find alot of them from, but they pop up on DSMtrader from time to time (which is where I got mine), and Ebay too. Good luck.