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NSNMotorsports sells the Microtech LT10-S ECU. I'd recommend going with that because it works with all the stock sensors and comes with a really complete and good writeup.

You can also try picking up a haltech e6x or e8 if you want, but you'd have to figure out the wiring on your own/
 

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Just as a warning all the engine management system for the Mazda3 are either cheap or effective, but not both. The Microtech runs about $1400, and I don't know much about the Haltech units but from what I can tell they aren't far behind.

Most (well, pretty much all) piggyback ECUs just don't work on the Mazda3; the stock ECU eventually overrides them or just gives up and goes into limp mode.
 
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