(1) The $45 upgrade on the H11 Xtreme xenon kit
is for "Philips" HID bulbs. These bulbs are rated to be slightly brighter then the standard XenonDepot 4300k HID bulbs. They will also colour shift, and reach colour temperatures of approximately 4700k once fully colour shifted. You definitely can't go wrong either way you go though.
(2) Use coupon code 'MOPARHID' upon checkout to save $25 on your order, and ensure you receive the necessary capacitors when upgrading the lights on the 2014 Cherokee.
(3) Warranty - There is no legitimate reason for this upgrade to void/effect your warranty in any way. Our HID kit powers the ballasts directly from the battery, so the only thing you end up using your stock headlight harness for is simply to trigger the lights on/off.