Suspension was Tokico shocks, Eibach springs, Racing Beat sway bars. It lowered the car about an inch and are slightly stiffer springs (145 lb/in front/117.5 lb/in rear vs. 121/95.5). I *think* the MSP rear sway bar will work on a P5, but I can't say positively that the rear subframe is the same. Although I'm pretty sure a few guys on the Mazda forum have them.
The brakes are larger rotors and different calipers. (10.8" front rotors/11.0" solid rears, single piston calipers all around.) It's all parts bin stuff, I think they were from a 626, but don't quote me on that. There is a vender on the forum putting together a group buy on all the brake components to upgrade Protege's to the MSP stuff.