Mazdaspeed Sport Seats, Mazdaspeed "Dimples" steering wheel.
Autometer boost/vac, fuel pressure, and air/fuel ratiometer gauges. Team Voodoo brushed aluminum shift knob and brake handle. Polished vent rings.
Outside? Just the Mazda front/rear lip and lip spoiler.
Oh, and Zoom engineering side view mirrors! I love these mirrors :)