If you wish to run the drive by wire throttle system,then you need to enable the drive by wire option in your MOtec ecu,this costs extra money.The ignition coil you can use the original campro one,but you need an igniter/coil trigger pack which can be sourced from chop shop.The other stuff if you want to use traction control,quick lambda or etc,you need to enable it also,and again,extra costs.And you also need to buy the socket for the ecu and the wires,or you can ask somebody to make it for you.
I am not a certified Motec dealer/seller/installer/tuner.I just have a little bit of experience with Motec system.
In terms of performance gain,it is hard to tell since it depends on the state of tune.If the tune is good,expect to have a better throttle response,increased torque and horsepower by 4-7% along with nicer curve,but dont expect too much on ECU,you certainly need mechanical upgrade as well.