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#2
02-06-2016, 10:00 PM
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Not reading real well today. Just noticed the OP called out the hard metal line, part 11. Sort of hard to understand how or why that would go bad. The vacuum valve, part 8, and the air pump, part 1, are common failures.
Maybe an o-ring failed? If the metal pipe is occluded with carbon, that means air isn't blowing into it properly and more parts are probably bad.
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David.X5 2001 X5 4.4i Sport SOLD! at 160k miles 
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#3
02-07-2016, 06:27 AM
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Doh, read that as secondary air pump too!
It doesnt look like much trouble but I echo the question on why? That pipe looks like the least likely thing to fail in the entire system. We are talking about BMW's though so I wouldnt be surprised if those break too lol.
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04 X5 3.0i auto 03 X5 4.6is
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#5
02-20-2017, 12:44 PM
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This maybe a long shot for the E53 but the E60 has a vacuum operated a exhaust valve near the tailpipes that open up under increased vacuum when engine revs over a certain rpms maybe that valve is stuck open OR you forgot to plug in the vacuum hose for it after your repair.
All this is me assuming the E53 has the same setup there as the E60's. Hope this helps. I stumbled on this thread as I have intermittent opening of that valve when driving thru heavy rain......??
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E39 528i 1998, 5 spd black, 350Kkms and going..with new owner. E60 545i 2004, 6 spd steptr. mystic blue, Tom Sellick's old car, Adaptive steering, Adaptive Xenons, Anti dazzle mirrors and FAST!!!, BT&Aux+SB Chime+Dig speedo+iDrive discl. Coded
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#6
02-20-2017, 12:55 PM
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The E53 M62 4.4 does not have those vacuum operated flaps on the muffler. I don't know about the 4.6 or 4.8 variants, but the OP has the M62 4.4
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David.X5 2001 X5 4.4i Sport SOLD! at 160k miles
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#7
02-24-2017, 03:30 AM
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Neither the 4.6is or the 4.8is have the flaps
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A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams  2003 X5 4.6is Estoril Blue 2005 Infiniti G35X 1972 Datsun 240Z 1991 Isuzu Impulse XS Sold 1972 Fiat 850 Spyder Donated 1972 Datsun 240Z Sold 1972 Datsun 510 Sold 
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#8
02-24-2017, 10:29 AM
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20 days later I hope the part/noise finally resolved it self. Let us know did you DIY or pay the dealership?
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 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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