4G_Aidan

You can also have Link modify the plugin to provide you with some extra I/O if required. Quick note on the EVO1-3 pnp, from memory Ign 4 is used for ECU hold power which used to prevent you from being able to do direct spark but the latest software release lets you use any other ignition drive for that cylinder 4 coil.

The plug-in ECU is cheaper than the wire in because it has fewer inputs and outputs available, despite being based upon an Xtreme.
So - you'll need to have a close look at the available inputs and outputs, and see if your current (and future!) requirements are covered.
That's a trade-off only you can consider.
I ran out of inputs and outputs on my Evo 1-3 running a 6A13TT engine from a Legnum VR-4...