So, after a month of frustration with the Opt7 Bolt HID kit, now gonna try the XenonDepot H11 Extreme kit from KBCarstuff.com...I can say that the customer service at Opt7 was VERY good, and they TRIED to keep me happy, but in the end, their kit was just plain unreliable. When they finally kind of threw their hands up in the air and said that it must be a problem with the new Yukons, I gave up. Went through 4 bulbs and a ballast in a little over one month. Yikes. My wife and I would laugh and play the "headlight lottery" before starting the truck up the past couple of weeks, as we never knew which SIDE would light up (at least we always had ONE side light up, never did have both fail), or if they would both light up...
Hopefully the XD kit with the Phillips bulbs do the trick...we will see.