xp20 year oct 08/xp20 year 2009

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hi
I have a pre XP20 bought in oct 2008 is percfect and my friend instead a pre XP20 bought a month and are different with one another without the gain and advantage, but with more gain in volume. I want to know what changes and why this choice.
thanks for your reply
regards
gustavo Savarese
 
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