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It's fine if you want to wait if it makes you feel better, but let's ease your worries...
Just read the last page of that thread...the 2 issues people had were with 2 very common problems these engines have, and I'm 99.99999999% sure they were coincidental.
The plastic OEM charge pipe is known to crack often, and that's why there are so many metal/aluminum aftermarket offerings for them, as there is no performance benefit from replacing them, only reliability. This should almost be part of a preventative maintenance program, it's that common, and for sure if any performance mods are done/planned. When it does crack, one would be a fool to replace it with an OEM part.
The vacuum lines get brittle and crack with age, on any car, but on the N54 the problem is accelerated due to the high temp these engines operate in. Replacing these lines should be a preventative maintenance item, and most who do, choose silicone lines to replace them with as they are tolerant of higher temps and last longer. They are cheap and easy to do, only hard parts are the 2 turbo waste gate actuators, but do-able.
Furthermore, there is a vacuum line under the hood leading to the driver's side fender area...this is the line that runs back to the flap actuator which is opened/closed by a solenoid(what you're disconnecting in the trunk), and the solenoid controls vacuum applied to the flap. Some, when replacing their vacuum lines, leave that line disconnected and plug the port to seal it, as it is no longer necessary. Think of it this way, it's similar to your kitchen faucet, except that the faucet is under pressure, and the exhaust flap is under vacuum...
Water comes in to the house/vacuum is being made by the engine, both are always there.
Your kitchen faucet is a valve/the exhaust flap actuator is a valve.
Your kitchen faucet(valve) is being controlled (opened/closed) by your hand/the exhaust flap actuator is being controlled by the solenoid.
Your brain decides when to open/close the faucet/the car's DME decides when to open/close the flap.
The DME does not communicate with the solenoid, except to tell it to open/close, but has no clue if it is/not actually doing it's job.
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