^We're getting a bit off-topic, but if that was meant to convince me, your too late. I'm already running AI.

Mine is (currently) water only and a very simple (inexpensive and reliable) boost-activated system.
Since I don't run methanol, I don't count on much of a drop in IAT. In fact my IAT sensor is located pre-nozzle, and obviously I don't tune with it.
Thus,
my AI only controls 3 things...knock, carbon and heat. The reduced heat is mostly seen in the
lack in of temp spikes
I previously saw after periods of hard boost. It's those kind of heat spikes that IMO tend produce alot of stress to things like coolant seals.
Good to hear about the clean rotors and seal grooves. My car's put up for the winter but my winter 'list' includes changing out plugs. Unlike before, there's been really no indication they're in need of changing...even though they've been in there about 50% longer. I've had no hard(er) starting, no break up, no slightly lumpy idle. Curious to see what they look like.