hey guys just wondering i have a kenwood excelon deck from my old car and i want to put it in my 06 GP GT and i went to get a install kit from futuresh*t and the guy said i have to get a module for the chimes and security system due it all going thru the audio system!! so my question is, is this expensive little thing absolutly nessesary? has anyone had problems with aftermarket decks in a newer gp?? also what size speaker is in the door?? thx dale