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+1 for a header and tune. This will change sound and feel of the car. If you would like to go for the "subie rumble" then go for an unequal length header(UEL).
Catbacks/Axlebacks are usually for sound but will have little gain paired with mentioned above.
+1 for keeping the stock intake. There's been a few posts and some videos on YouTube with dyno testing but take it with a grain of salt.
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