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Just got my new GT 3 last week. Yesterday after about 400 miles the sound with the PSE on got very loud and sounded much different than I had experienced with the car from day 1. The familiar blast upshifting was gone . Sounded like the baffles were not completely closed or open. I read some other sites and learned about the vacuum tubes not being secured.

Sure enough I found the rigid tube that connects to the rubber section just before the valve was loose, but only on the right hand side.The left side felt firmly in place. I wiggled it until it felt secure and bingo all is well. I am bringing it in to the dealer to secure it tomorrow.

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The PSE was checked out by the shop foreman and a master tech . today at Suncoast Porsche. The system is fine. I did not understand that the GT3 PSE  behaves very differently than other 911's due to the high rpm's. The system will open without the button being pushed under rapid acceleration or high rpms.

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So, what you are saying is that there was no problem with your PSE, correct? I have used PSE on my GT3 many times. It is slightly louder at idle, but noticeable in a quiet environment. While driving, the only difference in sound is detectable during rapid acceleration (up to 4200 RPM, of course; it may become louder at higher RPMs), compared with baseline.

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