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Whereas CAI gives better performance increases, it means doing away with the engine cover and many peeps don't like to do that while under warranty. Also, unless you go the 'jonnyc route' of lots of very attractive looking but functional mods, the 2.0T FSI is fugly without a cover and slightly more open to the elements (wet).
Of the panel filters available, the ITG enjoys an excellent reputation and is a nice tight fit (said the bishop to the actress).