For those of you looking to make the change.

Just went through this exercise and after a lot of mucking around and assumptions here and there it turns out that:

Stock 06 STi injectors are in fact 550cc TOP FEED, NOT side feed.

Couldn't find the injector thread in search, and frankly, couldn't be bothered finding it after 10 minutes - Can mods sticky it when it resurfaces? Thanks.

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TD06 - Oink.