[asperformance]

the rear diff would need to be changed because of the 4.44 FD ratio in the P1 biox but it is std size (R160) same as a UK car................

have never found any difference strangth wise between the STi's/UK boxes as they are basically the same unit, however i have a number of customers running nearer 450lbs/ft through them so they dont simply implode

i find boxes generally are very subjective depending on how they are used/abused rather than power level, with aggressive down shifting being the main issue