Yeah the Si (US) is the eqivelant to the VTi. Same engine & tranny.
You shouldn't need bigger lines. But a better fuel pump, adjustable fuel pressure regulator, fuel rail, etc would be a good idea.
I don't know what the Apex forced induction kit is, but you don't want to waste money on a header if you get a turbo. The turbo will have a custom manifold. Dual exhausts have to be calculated a little differently for flow. 2 2in. exhausts don't flow like a single 4". I would advise going with a single 3" all the way from the cat back.
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