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First off, early congrats -- I wish you the best on this journey.
1) If you don't want it too loud, on their own the Non-resonated Perrin catback or Invida N1 is amazing. But seeing that you'll get headers and maybe other stuff down the road...I would recommend sticking with the Resonated Perrin or Q300. With just a catback, no you don't need a tune. Headers...you have a lot to choose from EL vs UEL. But personally the Open flash headers + openflash tablet isn't a bad deal. Yes, with headers you'll need a tune.
2) Do not get an intake. Drop-in filter is more than enough. If you are persistent on it. Make sure you get a ecutek tune or get a CAI that comes with a MAF map otherwise you'll have a headache trying to get your trims set.
3) No idea about the OEM sub, but from what I've read there are much better aftermarket options at a lower price.
As Steve mentioned, check out his basic bolt on mods and tuning. There are also other great stickys on this forum with all the info you're looking for.
best of luck
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'13 BRZ (sold)
'17 STI
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