Hacking Same ISO twice on one USB HD?

[strakn]

I want to install a modded version of an ISO that I have already installed on my usb hd.

I assume I need to change the game id in the iso or something in order to install it along side the existing iso
but I'm not exactly sure what I need to change or what I change it with.

 

[sr_corsario]

You could try with the utility "Wii ISO Renamer" (to change game id) and "WiiPartitionBinChanger" (to change save ID)

 WiiPartitionBinChanger
You can now create your own TMDs for things like Guitar Hero that will then have their own save slot.