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Easy to do, remove the screws on the front part of the inner liners and pull out of the way, and you got free access to the horns.

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I just replaced the low pitch horn on my 04 Cayenne S. The only tools you need are a starhead screwdriver for the wheel well screws and a 10mm box wrench to remove the nut that secures the horn.

Total install was 30 mins, 10 of which was spent trying to get my arms in the wheel well and unclip the old horn from the cable coupler.

FYI, the low pitch horn is on the driver's side, the high pitch is on the passenger. Got the horn from Sunset Imports in Beaverton OR, for about $38.

:renntech:

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Replacing factory horn with compact air horn. The horn on a Porsche Cayenne is easy to access by removing a few screws securing the plastic wheel well cover. Using a 13mm wrench, remove horn. Keep the bolt, as you'll need to use it to install a 6" straight metal bracket (purchased at your local hardware store) to hang the new air horn. Install the metal bracket at about a 30 degree incline to keep the compact air horn from hitting the fog light on the inside of the bumper. You'll have to splice into the wiring harness (purple and brown wires) to power the new horn, because the factory harness has a plug that goes directly into the horn. If you cut off the plug, the wires are too short and inaccessible to splice into. Sounds great and louder!

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