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ok i have an 04 sedan es1 iv been looking to upgrade the sound system but i dont want a sub box that hogs my whole trunk i would still like to have acces to the spair if need be i ran across this box but it says 04-05 em2 what is the diff between a em2 and es1 trunk of the same year and would this fit

http://www.crutchfield.com/p_044CHCV...k.html?tp=1232

any replys would really help