Many noobs ask about Cold Air Intakes and Blow Off Valves. These are common discussions that have been beaten to death. Please read up on them in our FAQ Forum:
BOV's:
http://www.wrxtuners.com/forums/showthread.php?t=4688
CAI's:
http://www.wrxtuners.com/forums/showthread.php?t=4682
Other Frequently Answered Questions:
http://www.wrxtuners.com/forums/forumdisplay.php?f=95
BOV's:
http://www.wrxtuners.com/forums/showthread.php?t=4688
CAI's:
http://www.wrxtuners.com/forums/showthread.php?t=4682
Other Frequently Answered Questions:
http://www.wrxtuners.com/forums/forumdisplay.php?f=95