Are you looking to make your own custom rotated mount GT turbo kit? Then the TurboXS GT Basic Pipe Kit (WS-RM-BASIC) is a great place to start your quest.

This kit includes a unique externally gated uppipe that bolts to the stock header and is flanged for a TiAL 44mm External Wastegate (sold separately). A wastegate dump tube flanged for a Tial 44mm external wastegate is also included as well as an uppipe adapter to raise and rotate the turbocharger. The downpipe for this setup ends in the same location as the standard TurboXS Downpipe (WS-DP). This kit includes all gaskets, hardware, and oil and coolant lines for both the STi and WRX.

In order to have a complete rotated mount GT Kit you will need the following parts

If you have a TurboXS Front Mount Intercooler:
TurboXS GT Basic Pipe Kit (WS-RM-BASIC)
TurboXS Rotated Mount Intake Kit (WS-RM-INTAKE)
TurboXS Rotated Mount Intercooler Pipe Kit (WS-RM-FMPIPE)

If you do not have a TurboXS Front Mount Intercooler:
TurboXS GT Basic Pipe Kit (WS-RM-BASIC)
TurboXS Rotated Mount Intake Kit (WS-RM-INTAKE)
TurboXS Rotated Mount Intercooler Kit (WS-RM-FMIC)