How to customize the Microsoft.AspNet.Identity.Owin?

Hello

How to get rid of the DB storage for

 var result = await SignInManager.PasswordSignInAsync(model.Login, model.Password, model.RememberMe, shouldLockout: false);

This is an example from the MSDN Bootstrap demo project and I would use it as a starting point but this OAuth poses huge problems.

I have a different storage for passwords, different way for verification, etc. Can I override its interfaces with my implementation? Can I avoid using of EF?

Any clue?

Thanks.