The vacuum closes the valves (makes it quieter) AFAIK, mine barks on start up and quietens as soon as vacuum builds (997 though, I'd have thought 996 the same) _________________ 997 C4S Tip-S, 2007, Silver/Red Leather, PSE, Sports Chrono, Turbo wheels.
bakerboy4s Silverstone
Joined: 06 Jun 2015 Posts: 127 Location: Staffordshire
Posted: Mon Jun 19, 2017 10:43 pm Post subject:
Default is valves open, louder, switch pse off button illuminates and exhaust is quiet.
There is a reduction in exhaust note between about 2000 & 3000 rpm then it kicks in again, I understand it's to do with noise abatement in US.
PeterS Fuji
Joined: 01 Nov 2009 Posts: 9019 Location: Solihull
The vacuum closes the valves (makes it quieter) AFAIK, mine barks on start up and quietens as soon as vacuum builds (997 though, I'd have thought 996 the same)
No, the 996 is reverse.
(Don't ask me why, EU noise emissions I would imagine) _________________
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![Porsche 911 [991]](./images/models/998.png)
![Porsche 911 [997]](./images/models/Model-997.gif)
![Porsche 911 [GT]](./images/models/Model-GT.png)
![Porsche 911 [996]](./images/models/Model-996.gif)
![Porsche 911 [993]](./images/models/Model-993.gif)
![Porsche 911 [RS]](./images/models/Model-RS.gif)
![Porsche 911 [964]](./images/models/Model-964.gif)
![Porsche 911 [Early]](./images/models/Model-Early.gif)
