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Porsche Boxster 986 PSE retrofitting

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I'm new to this forum and the ownership of a Porsche.

I bought a 986 Boxster S from 2000 recently and in the deal was the original PSE included in parts. The previous owner has had it installed, but never wired it up properly.

Now I want to install it, but I have difficulties hooking up the electrical and pneumatic part of the system, since I want to be able to open and close the exhaust from inside the cabin.

I looked up several sources and found that I would need the following parts:

99661298003 - wiring harness

99661298001 - wiring harness

99661898003 - relais

99661398710A05 - switch 


My question now is do I need all these parts and if so, is someone able to give me some instructions regarding the installation process of these parts? Or installation instructions for the whole PSE?

Do I really need the relais? I have heard it is only there to turn off the exhaust when driving 50 to 70 km/h  and it is only needed in Switzerland.

The wiring harnesses are rediciously overpriced though.. I think I will make my own.


Best regards


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Hi Victor. 

I have the same problem.

In my case the previous owner install all part except the switch on the dashboard.

I would have the control of the system by the switch, but I don't know what parts I need in order to complete the installation. 

The relais installed is 99661898002. 

Have you find the solution of this isuue? 

Thank you in advance. 




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First of all thank you Loren. 

This means that I have to change the relais from 996.618.980.02 to 996.618.980.03? 

Then I have to buy the switch + the cable. It is correct? 

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Hi Loren, sorry if I disturb you but I'm in trouble with the switch connection.

Enclosed you will find the actual connection in my Porsche Boxster 986 S (Impianto attuale.pdf).


I'm not able to follow the previous diagram because of different wire colours and I don't wont to make a mistake.

Can you help me in found the right way to connect the switch? (step by step connection/disconnection)

Thank you in advance

Best regards


Impianto Attuale.pdf

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