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I have an ITG, no noticeable gains but atleast you don't have to replace it at every service so doesn't really cost you that much if you think about it.
Performance-wise probably not... I think the cup racers use standard paper elements which should tell you everything you need to know on the performance gains.
However there's an economic argument - £30 for a filter that will last the lifetime of the car (with cleaning) or £10-£15 a year for a replacement OEM filter.