First...I'm going out on a limb and assuming an 85 is the same as an 88 for this job. Second, this job is much easier with the car jacked up and the front wheels removed. Car on jack stands for safety of course.
1) Remove fog lamp covers and bulb/lens assemblies. Take photo of wiring for re-installation late. Disconnect wires. Push grommet back through the fog lamp bracket.
2) You can leave the fog lamp brackets on at this point if you don't have a front oil cooler, but if you do, you need to remove these, since access to one of the mounting bolts will be through the passenger side fog lamp hole. Each fog lamp bracket is held on with one bolt each, and requires a 17mm socket and wrench for backup. I'd remove them either way as this job is fiddly enough without the extra weight.
3) Remove the two screws on each side that hold the valence to the small body trim panel behind the bumper bellows. See photo below. On the drivers side, the front screw is hidden by the oil cooler foam seal, if you have a front oil cooler. You can still fish a wrench in and get it off. A ratcheting box wrench works well for this.
4) There is one mounting bolt inside the front fender on each side. The driver side bolt is easily accessed from the wheel well, with the wheel removed as recommended above. Unfortunately access on the passenger side is blocked by the oil cooler, so you have to work through the fog lamp opening. It's a complete PITA, as there is no access to the back of the bolt. These require 13 mm sockets or wrenches. The attached thread contains some additional photos and pointers on removing the "hidden" bolt.
5) Now you can remove the last two bolts, that are accessed through the frunk. These need 10mm sockets.
6) As Bentley would say, installation is reverse of removal.
https://forums.pelicanparts.com/porsche-911-technical-forum/912637-can-you-remove-front-valance-without-removing-bumper.html
