I could be wrong, but as far as I know there isn't a way to just unpack the cuh/cmu using a 'standard' compression program; you have to let CSM do it.
So what I do is install the mod using CSM and run it once (making sure to disable Auto-Restore), then I copy the whole GP4 folder into a zip, EXCEPT the GPSaves/Carsets folder, which I copy into another zip. The GP4 folder contains the installation options you chose which are now all set up for you to play. The carset is where all the variants can be found (like different cars, helmets etc, should you need them).