Head mods are some of the oldest tricks in the world of hot rodding. I've done valves, springs, guides, ports, and port/manifold matching. Haven't done cams or cam gears...yet. Still, she breathes like a thoroughbred when pushed.
The 15" wheel is the sweet spot for the NA/NB cars. Miatas started on 14"s, then had 15"s, then 16"s. The MSM was the only NB to have 17"s. Years of experience from the autocross/race guys have proved the 15" best. I had a set of the 17" Racing Harts. They do look good, but still heavy and with the low profile tire they contribute to the harsh ride on a stock MSM. The taller profile on the tires that work on the 15"s help give a smoother ride, yet something like a 205/50 on a 8" rim will be stretched just a little to firm the sidewall enough to give great handling. Another plus is that there is a large selection of tires available for 15" rims.
My hardest decision was which wheel to pick. I love the classic 5 spoke design like the Harts. I finally got a set of the Konig Spools. Ran them for awhile and now I have a set of the Advanti Storm S1 wheels. I love the look. The Spools are now track rims. 9" Dekagrams are up next for track days.
The Only Speed is Mazdaspeed