Make sure you replace it on a day which you have a lot of patience. That is one job I do not want to do again. Even with the upper plenum off, it was the most difficult job I've done on my Z. My recommendations: 1) cut the old one out. Don't bother trying to say it, it is a waste of time. 2) don't bother removing any of the interior/dash equipment. Just de-pinning the white dash connector on the harness is sufficient to get the blue ecu connector through the firewall. 3) in my case, I added additional electrical tape on some of the sections I felt it could use. At some sections I even went over the reflective material since I didn't want other parts in the engine bay fraying and tearing the reflective layers. The WS harness itself is a quality product. I am happy with my purchase and I am glad they offer it. In my case two of the wires on the white connector were swapped which resulted in my CEL not functioning correctly. After some troubleshooting I ended up finding the issue and it is all fixed now. I pointed it out to them and it appears that it has been fixed since then. Most likely an operator error on the assembly line.
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