Please don't ask a question that is already answered here:
http://www.wrxtuners.com/forums/foru...?s=&forumid=95
Subjects like CEL codes/fixes, turbo timers, BOVs, cold air intakes, modification paths, and manual boost controllers (and more) are all covered there. The long time members don't want to keep answering the same questions over and over, so we ask that you check the FAQs before you ask, and try doing a forum keyword search on the topic.
You can also find some good How-To articles written by other members in the Tech Article section:
http://www.wrxtuners.com/tech.php