I recently purchased an 04 Terminator and want to know if its possible to open and check the tune. To know what mods the tune is for and if the tune needs any adjusting or not.

I was told its a Sniper tune and when I saved the file with the SCT X4 it has the extension .bef

 

I'd try asking this in the Tech section specific to your year Mustang. Hopefully someone can help in there as there's always alot more members in it.

Good luck