Go to CorkSport Mazda Performance - 360.260.CORK: CorkSport is Mazda Performance.: Home and ask about a Microtech that would work on your car. I think it is the LT10s? It comes from Australia and takes like 3-4 weeks, but it's like $965. I have never seen anybody use one of those on a Miata, althought Microtech claims they have many MX5 customers. I know this guy who uses the Microtech units on pretty much every rotary car he tunes, and he loves them. Check out Microtechefi.com - The Official Microtech Engine Management Systems Website

 

Word to that, the Haltech software has a pretty steep learning curve. Especially if you're using one of their older ECUs that runs in DOS...