Both are bad...very very very very very very very very very very very very very very very very very very....BAD...Stock WRX+Intake= FAIL...Unless you are upgrading the turbo or plan on getting a protune an intake is pointless, stock airbox flows plenty. Save ## money for an Accessport and TBE
I was planning on addinng and HKS Carbon Ti CBE first. I figured I would oped up both ends a little as my first two mods. Why would this be bad and what would be better?
This is the best resource to consult when planning modification...Unabomber has thoroughly researched his facts and opinons. Trust me it is a great tool.
But to answer your question, the stock airbox on the WRX is a very efficient piece of equipment. The way it is mounted in the engine bay supplies the engine with cold air and flows quite well. Even the stock exhaust (cat back) isnt very restrictive. The restriction is in the downpipe, therefore the requirements for Cobb's Stage 2 is
1. Accessport (V1 or V2)
2. Turboback exhaust (new downpipe and catback)
3. For the best results a custom tune by a professional tuner (Protune)
Also something you will discover in your quest to modify, is that the 06/07 WRX has issues with downpipes. They usually lead to "boost creep" this could be potentially devastating to your engine, so fully research your choices and modification pathway.
I really dont want to get into the Mechanical issue vs EM issue about Boost Creep. I will just say that for some EM does a significant amount while for other (mostly in cooler areas) its not enought, because it is a MECHANICAL PROBLEM.
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