I know to run to its potential or how VW made it from the factory it needs that stuff, however as the map controls whats going on i suspect you can do just the turbo - i guess really what i need to know is the only option a custom map and if so, what kind of money are these as its probably not worth doing if thats the case as custom maps are usually pricey.
I'm only after putting it on to sort things out as they are, so same or less power isnt an issue in the short term until i get the rest of the bits as im likely looking at another £1k in parts to do the job fully.
Otherwise the turbo will just sit in my garage until i do have the other bits and pieces ready