Or do I need anything else aswell?

If your Turbo 2000 is version 5 or 6 then yes. If it's older then you may also need the rear shafts, depending on diff type on your car.

Its a v5/v6 so will be just direct change?

Thanks

Yes it can be done my mate did it , don't know what's different between the uk box and p1 tho ? Ratios ?

P1 has the gearbox from a 1999 Legacy GT-B (chassis type BH5B).

1st 2nd 3rd n 4th are shorter gears resulting in quicker acceleration and 5th is longer

What oil do I need for p1 gearbox and rear diff?

I can have a look in the workshop manual but would say something like Motul 300 75w90 would be fine. 

But Tim/ Oilman from Opie oils is on here best to ask him very helpful http://uk.subaruownersclub.com/forums/user/609-oilman/

Is that for both? Cheers

I would use it for both :) But would still PM Oilman they might have an alternative with Club discount code :) 

Messaged him cheers

No worries mate. Always goof to try save some money :D