The 8707 / 8708 ecm's have slightly different hardware inside Unknown what all differences are but $58 at least chokes in the 8707. There is one calibration which will run in both ecm's. Is it AKAL?? I'll have to check the home PC because I can't remember for sure. But I have worked on disassembling it more than once, and in fact there's both an 8707 and a 7749 on my test bench from about 5 years ago when I last played with this.