man u having fun with ur X5 aren't u!! hehehe
actually who wudn't!!
hey once i saw this X5 in banani super market with huge 20 inch rims.. man looks so good...
Got this sorted out, apparently the whistle is from the "Intake" as they have revised that in the 4.6 to cope withe extra hp. it actually sounds like an aftermarket intake system....pretty cool...thought i would share.
'07 Lexus GS430
'04 Kawasaki ZX-10R
'03 BMW X5 4.6iS - SOLD