Passat 35i 1Z: Hissing Noise - Diagnosis & Repair

Hey everyone!

Here's a translation of the German text:

'Here's a problem I'm having with my 1Z:'

Bei starker Beschleunigung zischt er (vor allem im 3.-5. (Gang) is clearly audible.
I've already submitted it.
Replaced the LMM (mass airflow sensor) with a self-made adapter for the compressor, sealed the hoses on the intake manifold (crankcase ventilation, vacuum) to the turbo, added 1.2 bar according to VAGCOM... nothing to hear... it's tight!

The engine is stock except for a chip (1 bar boost, increased fuel injection, etc.), the missing snorkel on the airbox with a K&N filter, and the sealed EGR valve.

The problem only occurred some time after the modifications mentioned above.

Sure, here's the translation:

'Any ideas?'

This is a simple question that asks for suggestions or proposals. It can be used in a variety of contexts, such as brainstorming sessions, problem-solving discussions, or even casual conversations.

Here are some examples of how you might use this phrase:

* 'We need to come up with a new marketing campaign. Any ideas?'
* 'I'm stuck on this problem. Any ideas?'
* 'I'm bored. Any ideas?'

The phrase 'Any ideas?' is a versatile and useful way to solicit input from others. It's a simple question that can be used in a variety of situations.

Thank you in advance.
ChaoZ/Christian