From what I know, not as scary as you would think, probably get change out of 5k which is pretty good bang for the buck. Others here may be able to give better indication of figures. As far as I know you will not have to upgrade the intercooler at that power level but you would be on the limit off it to so if you want more later, the intercooler will have to be done.

A good chat with Spiro will be a good idea, he will look after you very well.