Stepdad got a puncture in his merc, he only knew cause it said so on the dash. I would see changing tyres to non runflats could cause problems if the insurers want to be arsy about it. However in some cases it would pass without doubt.

However, imagine say on an Evo, they come with cut slicks as standard, if you replaced them for budgets, surely they wouldn't do you for this.

Also brakes, I can't even remember what PADs if i did, tell them what pads my evo had in it.
I said it has 6 pot AP's though, i wonder now there different if they would kick up a fuss?