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What did they add for 04' that's not on the 2003. Appreciate any response.

 
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depends if you're talking coupe or sedan but other than that probably not much except for newer equipment i have an '05 accord ex and the exterior looks the same as the '03, it's mostly just a difference in the year number, but like the 2006 model is completely different looks and interior.

 
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There were not many big changes from '03 to '04. Subtle styling cues may be different depending on the trim level that you pick out. The wheels may be a little different. The stereo may be a bit different. That's about all though, they are basically the same car. (I used to work at a Honda dealership) Hondas are great cars, I'd recommend one. Also let it be know that Accords are the #1 stolen car in the USA.