tried the psarc method with motorstorm 2, the ms2.psarc file was over 4gb so i tryed to split it up the PSARC file.
i even tried to rename it pac22.psarc but every time i droped the file onto PSARC, PSARC crashed. it worked fine when using it with uncharted2 which works fine.
sorry i made a typo with the rename, i renamed it to pak22.psarc still no luck even with the gui versions. all i get is a "working directory" folder created with in the PSARC folder.