Stock wheels and tires so far. My fourth Mazda, although it's really more of a Ford I suppose.
Edit: For winter, I bought a set of Toyo Open Country G-02 Plus tires. Found a set of twelve-spoke aluminum rims from a '97 Grand Marquis at a local wrecking yard -- perfect fit, and they look sharp as heck.
SG2, a Freedom Trifold tonneau, and removed the mud flaps after I took this cheesy picture.
Edit: Installed a 7" x 30" piece of plexiglass over the grill using four zip ties. Hoping for aero benefits and less cold air entering the engine compartment.
Lots of reading to do, and probably some questions to ask as well. I like some of the Rocket Ranger's aero treatment, and front mask / bra modded to cover the fog light indents and the big hole in the bumper might be next. Smaller side mirrors? Lighter wheels with more fuel-efficient tires? Front air dam?