WelcomeOriginally Posted by monkeyturd
The first modification for any 2.0L WRX owner should be removing the catalytic converter in the uppipe. Here's a thread that goes into a little more detail:
Attn '02-'05 WRX Owners: The Importance of the Uppipe Mod
The Injen CAI is one of (if not) the worst on the market. It requires a custom tune (a Cobb base map won't suffice). Remove the intake immediately and reinstall the OEM airbox.