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Originally Posted by chris_barry
I havent looked under the X5 diesel, but my past cars were Saab turbos and they had a hooter valve. This was actually what the service guys called them. It is simply a turbo blowoff valve, like what the boy racers have, except it vents back into the inlet tracts so you only hear a muffled hoot.
Get the 3.0d on boost and lift suddenly. If it hoots its just the blowoff valve operating. On the SAAB's they have an uprated version of it that didnt hoot. The uprated version was a bosch motorsport version.
Chris
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Won't be the blow off valve because the engine is under power. I know the sound your talking about, this is different and not as cool.