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Hearing diverter valve sound after major service

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Hi all,


I did a large amount of work to my 08 Cayenne Turbo and am now hearing diverter valve/pressure relief sound if suddenly letting off the gas, especially at lower speeds.  It reminds me of what I have heard on other cars, but I’ve never had it on this car.  It’s not a “honk” per se; it’s what I consider normal DV sounds.


What I replaced;

- Coolant pipe, thermostat, water pump, acc belt

- Air filters (Mann)

- Spark plugs


I inspected the DV lines and did not see any issues, but maybe the hard line got damaged?  I realize I did a lot of work on it and may have caused this problem.  Or I might have fixed something as I replaced some aging vac lines that came apart during disassembly. I was also going to check the airboxes as maybe one/both is not closed correctly.


I am hoping this is normal or related to the non- OEM air filters.


Please let me know your thoughts!

Edited by millerchris85

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I ordered the Mann filters thinking they were the same/similar to OEM, but they may differ.


I may try an OEM set next.  Unfortunately discarded the old filters.


Anyone have observations of this type of noise?

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