whats the diffrence
 

whats the diffrence between the safc and the safc2 and what one should i get

Neither, the SAFC does NOT work well on FD's. Do a search, I think DaleClark has posted the reasons quite a few times.

If you need to mess with the tune get a chipped stock ECU from a reputable company, or go standalone with the Apexi PFC.

https://www.rx7club.com/showthread.p...ighlight=safc2

:)