Try a forum specific search?
https://www.google.com.au/search?q=site ... s-wiz-serpYou’ll need a full set of parts from, or for, or to suit a single scroll car, including an auto or manual trans specific single scroll dump, headers & uppipe, a tmic (or fmic) to suit your choice of single scroll turbo plus any other mods to support your conversion, eg a tune, 3port boost controller (generally optional but worthwhile since you’ll likely need a tune).
All audm gen4 postfl GT models my07-09 are single scroll with mildly unequal length headers as stock. My08+ wrx parts are similar and some will also fit, not sure if this includes the dump pipes.