SilverSteel

On a non-PSE, the question is does the circuit need a charge to "open" the valve? If so, then theoretically disconnecting before the car is started would prevent the valve from being activated.

Secondly, if temperature controlled with a sensor, then it would likely relay the temperature to the computer and when it hit the appropriate temperature, it would send the charge to open it.

LRsCarreraS

Agree with all. The real question is this valve normally open or…normally closed? If it’s spring loaded, normally open, then unplugging it should keep it open and therefore more sound. I know the vacuum valves work this way, but not sure on electrically actuated…. Hoping a big brain (or at least someone with first hand knowledge&#128521 wades in on this!

Schnave

I found a very informative thread for a non-PSE Macan’s exhaust valve. Your Cayenne probably works in a similar manner. The valve is closed below 3,000 rpm. Thread discusses sound change when forcing it open.

https://www.macanforum.com/threads/w...on-pse.152529/

One posted a video of his valve opening and closing while driving. Includes Picture in Picture of dash while driving. It’s a pretty busy valve: It opens and closes many times during a drive.

Silververtu

I have non-PSE on cayenne turbo which has 2 values on each side of the inner exhaust tip/pipe. I know the values are closed in stationary regardless which mode it’s in.

LRsCarreraS

Anyone know if the same set up is used for the Cayenne? Will talk to dealer mechanic I know, but might not mess with it if it's moving that much...

SilverSteel

Damn thing looks completely random, no correlation to RPM's.

1FSTREX

Bumping a really old forum post, but I didn't find anything newer with better information. Did anyone make any headway since 2021 on determining if you can bypass the non-PSE exhaust valves for a better exhaust note?