to me the best alt is the oem 220amp direct bolt on. part number 13536552. can be had used off ebay with low mileage for under 100$ or any auto parts store.
the corvette guys love the high priced mech man stuff, I'm not a fan. they seem to have a high fail rate to cost to me. and unless they have updated, the new gm alt is a better design to start with. they call the regulator a hairbrush style if you want to Google and research it.
personality, it seems weird to me to not run both batteries thru the current sensor. is there a setting somewhere in the code that uses different math when it has a rpo code for a 2nd battery factory? maybe it knows only half the load is going thru the sensor?
