CMS to use for existing CI app

[eluser]Unknown[/eluser]
I already have a working web app built on code igniter, is there a CMS I can quickly plugin to my app to handle some aspects like users?

Or would I need to rebuild my app following specifications set for existing CI CMSes like Pyro and Bonfire.

Thx.

[eluser]retypejonas[/eluser]
I'm upvoting this.

I'm new to CI and wonder if theres any complete package for this floating around.

Since whatever web app you create, there will more or less always be a need for some content editor to do some basic cms work.