This post supercedes previous posts regarding the installation of the Team X-Sim Porsche skins for rFactor. It is now much simpler to download and install the skins since they are now packaged with a Windows installer file.
You will need to download and installl two different files.
1.) The PCCA 2007 Porsche Carrera Add-On for rFactor (not created by me), which can be found here: http://www.megaupload.com/?d=LMKC298U
2.) The Team X-Sim Skins for the rFactor Add-On you installed above, found here: http://rapidshare.com/files/157473226/Team_X-Sim_Porsche_Skins_for_rFactor_PCCA07_Mod.msi
Now start up rFactor, click on 'Player' and choose with verion of the Porsche Mod that you want to run.
After choosing the mod of your Choice in rFactor, you need to choose the first vehicle and then click skins. On the Skins Menu Choose Team X-Sim.
Now go drive and promote the community