I have the Cobb Intake, Cobb AP comes with an OTS map for it. No problems, easy install, 2011 WRX.
However, after running with it for a year and a half or so the sound is not cool/new/interesting anymore. As mentioned above, it's loud, like, vacuum cleaner in the passenger foot well loud. When I get the chance I am going back to the stock airbox almost assuredly so I can get the full range of the engine sounds back rather than the WOOSH.