Well you can’t nistune every skyline ecu as we know.
10 years ago, I had a mines ecu and a copy of everything it was tuned for, which matched my car perfectly, and easy access to 100ron fuel, and still people said don’t use it. Didn’t make sense to me. Still doesn’t. If you use the wrong fuel for your tune you’ll blow your motor, that’s always been a fact.
but yes correct, I wouldn’t chase one now, but if the circumstances were fitting I don’t see why they’re the paperweight everyone claims them to be.