no need for flashify. It is a kernel only so it wont mess with your current ROM install. Just download and flash in recovery. It is in any kernel format so you wont see a boot img in the zip. It extracts the current boot img from your current rom, unpacks it(splits it into the kernel and ramdisk) and then repacks it with my kernel and the roms ramdisk. As with anything else, make a backup before flashing.
OK I tried flashing it a couple times but it won't boot after.