Great post. I love tracking my ZHP and with the minor lack in power, it does make up in terms of performance after a few of those modifications you mentioned. One thing Miatas locally hate at Laguna Seca is getting passed on the back straight to the corkscrew like they were standing still while they can outcorner most cars out there.

Driver restraint, I would suggest Schroth QuickFit Pros which buckle into the car when needed and removable when driving the kids to school. Brake pads I would recommend pad swapping before track days but that maybe too much work. I used to swap rotors/pads for HPDE and used OE rotor/pads for daily driving. Exhaust noise = TSE3. Nuff said.