first thing it to swap out the two mid range by the front windscreen. replace those and enjoy the upgrade instantly, THEN upgrade the doorcard speakers... you may be happy with just the upgrade to those Memphis audio speakers and want to stop there. remember you will get NO money back on this investment when you sell the X5, so put in as little as possible if you are selling anyhow.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S