You better go away and do some more research mate. Emerald over any other management system is not a good choice imo.
Couple of facts first.. All the trigger items and sensors that you will need for emerald you will need for cossie. So the price you will pay for emerald is more to start with as the loom and ecu will cost more! Then you will need to take it to someone who will map it. That will cost another 500 quid so what a waste of money when you could have weber running better than emerald could and for far less money. Seams silly to me. Why not speak with some people who have had emerald and removed it to fit better systems.