What do you mean by that?
I'll try to post some screenshots later to explain it better.
EDIT :
Okay, so :
1) Launch Managunz.
2) Go to the PS2 game you want to apply the widescreen patch to, and press

to access the game options.
3) Activate the 16/9 option.
4) Then, you can leave Managunz and mount/launch your game via WebmanMod (for example). The 16/9 option will stay on unless you deactivate it through Managunz.
5) Be sure to activate the full screen option, either in the XMB or directly in the emulator's settings (next to the smoothing option).
6) Enjoy
•
Without the "16/9"Managunz option applied.
Look at the wiiiide character, the doors, the background, etc...
•
With the "16/9" Managunz option applied.
Note that the menus and other UI elements are still stretched, but otherwise everything is fine
• A
4/3 sample, for comparisons.