Moroso has recently released their new Air Oil Separator Kit for the 2006-07 WRX and 2004-07 STI, and Quantum Performance is running a special price of $349.99 (normally $392.90) for a limited time. This new "catch can" system is different from the others.
The Moroso system utilizes two tanks instead of your typical one tank system. One tank catches excessive vapors, moisture and oil at the crankcase, and recirculates air back into the intake. The second tank catches residual oil and moisture from each cylinder head. This allows the crankcase system to breathe separately, as designed by Subaru originally. Moroso is the only company currently offering a system that accomplishes this. Additionally, they can also be polished or powder coated easily for a nice custom look.
Please email for more info or to order.