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Re:Tesla’s Model S Gets “Ludicrous” Mode, Will Do 0-60 in 2.... by briHass on Friday July 17, 2015 @09:44PM (#9906275)
They're done over USB. The system will look for specially named firmware files (*.up) and auto-apply.

This forum: http://mazda3revolution.com/forums/2014-mazda-3-skyactiv-aud... has some excellent info, and someone usually posts the new FW files. I've done an upgrade and the hacks myself.

Re:Tesla’s Model S Gets “Ludicrous” Mode, Will Do 0-60 in 2.... by mikeash on Friday July 17, 2015 @10:17PM (#9906344)
Nice. Not quite as convenient as Tesla, but it's great that they give you the ability to do it yourself.