I am going to present the story of my installation of a Pioneer Avic Z120 BT navigation system into a 2001 Porsche 996. This car has the "premium' sound system with the separate non-Bose amp, non Bose speakers. It does not have the MOST bus.
The install consisted of the Euro Motorspeed 99-01 PORSCHE 996 CARRERA DOUBLE DIN INSTALLATION, the Pioneer Avic Z120BT, and the Pioneer GEX P920XM XM radio tuner.
There have been several changes and the details of manufacture of the chassis provided by Trieullionaire through his Euro Motorspeed company which sells on eBay.
There have also been several changes in the wiring schemata.
Euro Motorspeed Wiring Diagram
This is because the original instructions for the mechanics of installation of the chassis and the wiring diagrams were done in 2007.
Euro Motorspeed's tech man (possibly the owner as far as I know) was extremely helpful and patient with me when I called him at least six times over the weekend as I did my installation. I want to thank him and praise the professional nature of his company for their product and their assistance.
Probably the most significant change in the chassis is that it no measurements are required for installation. The formally describe 13/16 of an inch of setback is no longer demanded. Instead, one need only properly place the navigation unit in the chassis and positioning in the dash will be secured. One should note that when the chassis arrives it will have been shipped incomplete assembly form. That is the inner chassis will be bolted to the outer chassis fees for small Philips head bolts must be removed to properly attach the energy chassis to the navigation unit. Only after installing navigation unit in inner chassis should inner chassis be bolted to outer chassis. Also there was no support bar and my kit as this is no longer required with the new design of chassis.
Old Install instructions
Step one:
I had a great deal of difficulty removing the stock radio. The key's provided fit properly; but the fit was so tight that thespring tabs would not be compressed to an extent that allowed the radio to be removed. I was forced to additionally leverage the radio with small screwdrivers in order to remove it. Luckily this resulted in only one small scratch to the lateral dash opening.
I had no special problem sawing the center separation bar out. However this operation would be simpler after removing the entire plastic factory housing, as I later saw was suggested by Trieullionaire. I did have to remove the old metal radio support bracket in the deeper recesses of the dash compartment see below.
As you can see from the photo of my stock dashboard, it was not necessary for me to move my climate control unit and so I did not need to disassemble the lower compartment.
As previously stated there was no new support bracket to install.
Step two:
The following alterations were made from the original wiring harness instructions dated 2007:
If you're using a pioneer unit look up the directions for your model as regards the method of bypassing the handbrake fail safe as they will vary from the 2007 directions.
In the steps D. and E. in the 2007 directions, they directions should state to connect the yellow wire to yellow wire and the red wire to red wire. The harnesses have been changed since 2007 to make the color coding match correct.
I did not connect the rear view camera.
I placed the pioneer XM radio component in the little storage shelf beneath the steering wheel that is usually used to contain the owner's manual. I placed the XM antenna on the outside upper windshield frame, centered above the mirror; and routed the wire underneath the windshield rubber molding, around to the driver side door, and thus beneath the dash to the XM unit.
I placed the microphone atop the steering column via the double adhesive pad provided.
As per the instructions posted by p0rsch3 on the "Six Speed Online" forum page, I placed the GPS antenna underneath the infrared sensor cover, routing the wire directly through a hole for the infrared sensor to behind the dash.
I routed the wire for the Ipod integration cable down into the center console, through the center console, and into the center console compartment. I was able to do this without removing the entire center console housing. I only had to elevate the shifter boot and remove carpeting and one side panel on the passenger-side of the console footwell. With some finesse, and the aid of a grasping retrieval tool, I was able to pass the wire as stated. I did need to drill a small hole through the bottom of the console compartment and cut a small piece of rubber from the rubber liner for the bottom of the console compartment.
One last tip from trieullionaire that I found extremely helpful was to fit the surround in place prior to reinstalling the factory side panels that surround the side switches
As you can see the final installation looks extremely professional. I was greatly pleased with the quality of the kit I received from Euro Motorspeed, and all the telephone support they gave me. He even called a couple days later to make sure how the installation went.