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It is not actually for me as I have sold my Subaru, It is for a colleague at work.
He has managed to knacker 3rd gear and wants to put an STi gearbox in, personally I would have thought it best to rebuild the standard box with better internals.
The STi box has better gear ratios i think, so will accelerate quicker but loose out in 5th.
I have a UK and i am fitting the box from an import, the UK boxes have long gear ratios.