[Tireiron]

OK I rechecked things and the 04 STi hubs came 5x100 with the larger bearing and the 190mm parking brake. This WILL accept SVX rear axleshafts however it will also require the SVX r160 rear differential. The SVX axleshafts WILL NOT fit into the WRX r160 rear diff.

So if he swaps the 04 STi 5x100 rear knuckles with brembos onto his WRX he can swap in the SVX r160 diff with the SVX axleshafts. This will match his OEM WRX rear diff ratio of 3.54 also. He must keep the SVX axle shafts with the SVX diff though, because they will not fit into the WRX diff.