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OK, I'm looking at foot parts in the item shop. There are two pairs of feet with the same stats (Ft-Sp3.E and Ft-EM45) Speed 27 and boost 270, but the price of the EM45 is much higher than the Sp3.E (44500 cr as opposed to 29370cr). What's the difference? I can't imagine it's just asthetic. Are there hidden bonuses to using the more expensive ones?