Welcome to the board!
Which Impreza did you get? The RS does well with the normal intake/exhaust mods that most cars like... the WRX and STi love reflashes to safely unlock the boost, as well as exhaust mods.
All Imprezas get much quicker with springs or coilovers, and swaybars... and of course wheels and tires are the #2 thing that make a car faster (#1 is the driver).
As long as you've got cash to throw away, the sky's the limit on mods.
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