voodoo kernel yes.. the others aren't needed if the system is running.

install the kernel manually by copying the kernel from the files folder in the downloadable image to your root directory. it will be named mach_kernel.voodoo and this shouldn't overwrite anything there...
now when you restart, simple type in the boot flag "mach_kernel.voodoo" and it will load this kernel. so it will allow you to test it out and make sure you are getting the most out of the kernel before you make it your default.

just be sure to read the documentation that comes with it. It is most informative and will help you in the long run.

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