Tuning software:

http://www.efianalytics.com/TunerStudio

Be sure to read the readme that comes with the firmware, as that has good instructions for reflashing your firmware, and don't forget to set everything up for mazda temperature sensors.

The following link should be used to get the latest stable firmware revisions for ms1, ms2, and ms3.

http://www.msextra.com/downloads/

Documentation for the latest stable firmware:

http://www.msextra.com/manuals/