Want to get better performance, battery life and extra features on your Samsung Galaxy S4? Install custom kernel then (or install custom ROM). Yes, most of the custom kernels are tweaked for performance and added some extra goodies too. Hmm… There are a few Galaxy S4 custom kernels only for the moment no matter I9500 or I9505. Maybe most of the developers are still stick with Galaxy S3? Or Galaxy S4 is not their of tea at all. Hello, HTC One… Anyway, here is the guide to install custom kernel on Galaxy S4.