Changing over to philz kernel

Hi...I Had recently rooted my n7000 via to a zip file with busybox in stock recovery .plus I'm also on stock kernel with stock jb 4.1.2 ...I would like to change to philz kernel which also comes as a root plus cwm zip file .so do I have to unroot to flash philz kernel with cwm recovery or can I straight away flash philz kernel +cwm along with the root file as mentioned in philz post dated 21.8.13 with title philz-cwm6 n7000 v 5.11.2 stock kernel


And btw I'm a total noob...so pls pardon me for the retarded question
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