what car is this going into?? you dont want atts because its a pain in the ass to hook up, and its crap anyways. I dont know how many routes your exploring or what ideas u got running in your head. But ill also give ya this tid bit of info just incase. If for some reason you have to use a USDM ECU or need to look for one. You want a USDM 96 ECU. The 97+ USDM ECU's have the immobilizer in it. and i dont know whats involved in hooking that up or if you even can, because everything ive read people end up gettin rid of that ecu. THe 96 is the only USDM OBD2 p13 ECU that doesnt have the immomilizer. the JDM ecu's dont have the immobilizer in them, so you dont have to worry about any JDM ones.