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iTrader: (27)

Well I think I have decided to put 4.10s in my A4 Z28. With my 3600 stall and an MS3 in the future I think it will benefit me pretty good. I think I will be able to handle the 2k HW rpms and the sound. My question is this; where is the best place to purchase 4.10s? For those of you that have them, was the difference over stock very noticeable? How happy are you with them? Thanks,
Mitchell