This update will bring you to v3.5 in NFS: Porsche Unleashed and 2000!
This update will work with ALL versions of NFS: PU and P2k if you...
You may have to use the FULL install option...
Follow these instructions!

Unzip: nfs5.car  nfs5.prt  and  nfs5.trn to:
C:\Program Files\Electronic Arts\Need For Speed - Porsche 2000\FEData\Data
OR
C:\Program Files\Electronic Arts\Need For Speed - Porsche Unleashed\FEData\Data

Unzip: festrings.csv  festrings.loc  and  hudstrings.h to:
C:\Program Files\Electronic Arts\Need For Speed - Porsche 2000\FEData\Locale
OR
C:\Program Files\Electronic Arts\Need For Speed - Porsche Unleashed\FEData\Locale

Unzip: porsche.exe  properties.txt  and  version.txt to:
C:\Program Files\Electronic Arts\Need For Speed - Porsche 2000
OR
C:\Program Files\Electronic Arts\Need For Speed - Porsche Unleashed

Make sure you overwrite ALL files.  Make backups if you want but this has been tested to work on both NFS: P2k and NFS: PU.