Default [Q] GPE and ElemntalX Kernal

Hey I just wanted to know if it was ok to flash GPE 4.4 and ElementalX Kernal? I'm looking for good battery life and have had nice luck with this set up - Mahdi Rom and ElementalX on my Nexus 5, which is my work phone. Also, could you provide a link to GPE 4.4 because i'm not sure if i'm looking in the correct thread. Thanks so much .