E53 D sport 2005 UK Right Hand Drive...
On the inner wing in-front of the washer bottle, there is a large sausage shaped thing, with ribs on it....
NO it is not a sex toy before we start.
It has a 10mm od / 4mm id tube out of one end.
When the tube is pulled off the nipple, the engine note changes to a deeper tick-over sound at the exhaust & back to normal when plugged back on, even tho the revs remain the same.
What is this device & what does it do ?
Any ideas ?
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What is this thing ?
Re: What is this thing ?
Vacuum reservoir for the turbocharger control. If you leave it disconnected you’ll have a distinct lack of boost. Connected and it excites the performance of your engine ... 
Never anthropomorphise computers. They hate that.-
X5-D-Sport
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Re: What is this thing ?
many thanks... defo leave it connected.
Re: What is this thing ?
When i first got my e53 that was the first vacuum pipe to fail (day after i got it ).