Does anyone know what size speakers can be put into the front and rear grilles on a 4dr Turbo?

I'm getting mine in Jan, and I want to replace the standard ones as soon as poss!

Go to your local I.C.E. dealer and get some Infinity reference speakers for the front and rear. I have them fitted in mine and they are the dogs wotsits. They are also very reasonably priced at around £60 per pair. I was convinced they were going to be at least double that. None of the manufactures listed a custom fit speaker when I got mine changed in October but I would argue that these are better anyway. My local Subaru dealer fitted mine for me because I couldn't be bothered trying to work out how the rear shelf came out. Hope this is of some help.

16cm fit both the front and rear.