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Hello, I sometime hear my turbo whistle higher and lower instantly when idling.
I also got a low boost issue. I also checked and there was no rust in my wastgate.
I got no boost leak and brand new diverter valve

Could it be a vacuum leak or n75?
 

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B5 A4 2.0 Stroker, 2016 VW Touareg
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2,043 Posts
Hello, I sometime hear my turbo whistle higher and lower instantly when idling.
I also got a low boost issue. I also checked and there was no rust in my wastgate.
I got no boost leak and brand new diverter valve

Could it be a vacuum leak or n75?
Vaccum leak. N75 valves never really fail
 
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