i dont think that throwing an S85 in an X5 is a good idea.. S85 is a rev loving engine and if you combine it with X5's weight it may not be good.. S85 is a great engine but it ll be more special if you swap into a 3 series and it fits.. if you want a faster X5-X6 you need an M.. its totally different than you think probably and it ll be much cheaper for you..
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