what is the differance between ems, ecu, piggyback and safc?

a full stand alone and a good dyno tune will see gains on a stock motor.. i have i/h/e and juggling whether to go hondata / aem ems / power fc at the moment.. i wouldn't bother with safc imho.. i got offered a vafc for my civic for 50 bucks and it wasnt even worth that...
 
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