no need to swap harnesses, there will be extra plugs but you can cut and cap them off...
I did an auto to manual swap a few months ago, it isn't really much more work than a regular ol engine swap, just gotta make sure you have all the right parts before you start or you're in for a headache running back and forth to get what you need
won't I have to use my si harnesses in side the car for the ecu and vss ?
And thanks for are y'alls help..