I currently run an Evo 8 (3 plug) ECU in my Evo 3 and I was wondering what the difference is between the plugin EvoLink 1-3 and the EvoLink 4-8 and IX (3plug) in terms of functionality. I know the connectors are different and I can run any of them in my car, but I wouldn't want to use the 1-3 if it is lacking in functionality over the newer Evo versions. There seems to be a large price difference between the EvoLink 1-3 and the others, but I'm unable to see why from the specs.