i was thinking the same thing. i have not used megasquirt before but it is huge with ford probe/mx-6 people (i use to own a ford probe). i went a different route in tuning my previous car, supercharged ford probe, but here is a great website with info on it
DIYAutoTune.com Megasquirt Kits / Assembled Engine Management Systems, Wideband o2 Sensor Systems and tuning products