I have a 2003 Honda Accord LX 4 cylinder with the single disk CD changer. I have the infamous buzz pop issue. I want to buy an upgraded radio but still Honda with either the six disc CD changer or the dual zone climate control setup. Has anybody ever taken the single disc CD changer radio setup and upgraded it to either the six disc setup where the dual zone setup, and if so is it a direct drop in? Any help would be greatly appreciated. Thank you!