Bcred, its from a 2001 model x5 and im a 2005 so not compatiable from my understanding.
He is also selling dinan exhaust too.
I hope he decides to sell the cai. I know it wont add performance and my only other upgrades r a mapping (thats apparently more powerful than a 4.8iS) and the 4.8iS exhaust installed. More want it for looks and i believe it may change exhaust note slightly.

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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