Im at the point where 2 pot calipers are not man enough to cope with the extra power I now have.So do the std 4 pots not brembos fit straight on to the std discs that the 2 pots come with

No the 4pot subaru calipers run larger discs but the calipers and discs bolt straight on just watch your wheel offset [emoji6]

I have bags of room behind my rims.What size are the discs on the old 4 pots?

I went from two pots on my MY97 and got a set of 4pots that came off a P1.

 

 

Godspeed can do you an upgrade.. http://www.godspeedbrakes.co.uk/impreza-ver-4-onwards-type-r/114-brand-new-4-pot-calipers-with-kevlar-pads-and-grooved-discs.html

Godspeed upgrade is very good

and at that price :)

My 4 pots came off a 97 p1 (along with my prodrive mats)

And I'm running godspeed discs [emoji4]