It will still be the mig 21 no matter what. They will for certain sell it as a separate module but it's still gonna be the unmanageable mig. Having avionics upgrades would give advantages but in a dogfight the mig will still have to scoot, unless there's a better engine... But anyway, it would make ground attack even more efficient and it's original job, intercepting a lot more fun because we don't need the GCI, which isn't really good at the moment (sorry ed)