I read someone post yesterday where they said what happens at higher boost levels is that you need better flow, not better cooling. The stock intercooler does a great job but flows like crap, flowing like crap means the air stays in longer which means it cools more, but you'll be restricted by flow not necessarily temperature at higher boost levels.
Also every aftermarket tuner has released an intercooler for their packages, Mountune, Cobb (soon), FSwerks, puma speed, etc. While we can be cynical and say they are just doing it to make money, I have faith that these tuners know what they're doing and are giving us parts that will help performance.