[Q] Flashing New Kernel

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http://forum.xda-developers.com – Hi I was wondering what is the best Kernel for the T-Mobile version of the SG2 when it comes to battery like and performance. Right now I am running CM10 4.1.2 and its stock kernel that comes with the ROM. I am fairly new to this whole process so if I flash a new kernel do I have to wipe everything or just the cache? Please help me. Thank you :) (HowTos)