What 'sti turbo' was it.
The early wrx has an upswept turbo inlet on a td05 turbo. The only 2 turbos that are a direct swap are upswept td05's and td04's (it's smaller brother that comes on early wrx wagons)
If it was an sti v1/v2 turbo with upswept intake it's the exact same td05 as the wrx.
Or have you fitted a front entry VF23/24/28/30/35/34 turbo and used a silicone 90' elbow?