Bearing in mind the std cooler is good for 650bhp (ie the GrpA cars) id not be in a major hurry to change it.

Get a gaybird charge temp sensor in it to see if it NEEDED first.

Injector wise, well they a totaly different shape (allegedly) to Bosche ones so duno if you can source any but tons of s/h uprated ones for sale.

Rest is easy...