Upgrading to a later model pump is possible but it requires making up custom hoses between the pump, rack and reservoir.
I did it all a couple months ago on my RS liberty.
You can buy all the speed flow fittings and hoses you need from somewhere like go-gear so that the new style pump becomes a bolt on affair.
All up it cost me around $500 to do the upgrade with a late model GDB STI pump, speed flow fittings, teflon braided hoses, and a billet alloy reservoir tank. I did the install myself so no labour charge.
Hardest part is lining up the speed flow fittings on the steering rack with the engine still in place. Its pretty tight in there so you have to do it all by feel. But if you can pull that off, the rest is a piece of piss.
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RS Liberty - Because WRX's are only good for parts...
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