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I've always ruled that you can take any feat you want any time you want whether you meet the prerequisites. However, you will only benifit from them when you do meet the pre-reqs. Lets say you take a feat at lvl 3 that you would qualify for at lvl 4, it you would gain it's benifit at 4 instead of waiting until 6 and being forced to take something just to tide you over.
I've always ruled that you can take any feat you want any time you want whether you meet the prerequisites. However, you will only benifit from them when you do meet the pre-reqs. Lets say you take a feat at lvl 3 that you would qualify for at lvl 4, it you would gain it's benifit at 4 instead of waiting until 6 and being forced to take something just to tide you over.