If you're gonna go with a KFL and if I may be so bold- look into either a black edition from Artemus or a V2 from ehpro
I'll link below- I have an authentic and those two, I prefer the v2 thee most with they black being closely behind. They have larger airflow hikes and are a tad easier to fill- IMHO.
V2 ehpro
Kayfun Lite Plus V2 Clone by EHPro
Black edition
Black Edition Kayfun V3 - Custom Mod Creation
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Seems like I'll be getting it from there. Thanks for sharing that link homie!