Hello Phil,

Welcome to the forum. I think you have a good plan. Changing from BUA to ARAP may require some changes to ARAP and to the vehicle. I haven't done this in many years but I believe the cold start injector should be disabled and possibly the A/C signal is different between the two calibrations. VATS disable is a great idea as well.

I think an easy comparison might be to load BUA in both banks of the emulator, but set the maximum vehicle speed to a very low value in the test calibration. If you set the maximum speed to 56kph, you should be able to easily tell if your changes are taking effect.