F-Con s piggyback

[shyne240sx]

i been using this piggyback for a few yr now and i dont know what was programmed into it, i got it from a guy who said it was for 550cc injectors and the z32 map senosor, i have either one on the car and it still runs fine so am wonder are u able to use a piggy without the mods, and add it later....cause i was gonna get some 550cc injector from my cousin and use it, and some tell me something about it .....thnakx am lost.....