YQatari

It's there to quite the drone when the engine goes to V4, and also makes the exhaust slightly quieter but looking at how it's designed, it's very resrtrictive. The only effect of removing it is slightly louder exhaust.

^ Yes, stock mufflers.

Here is a direct link to it: http://s1216.photobucket.com/user/yqatari/media/My%202014%20Silverado/IMG_55821.mp4.html

Yes, stock 6.2L exhaust with the adaptive valve removed.

I deleted the valve and it sounds much better!!

UPDATE: I took my truck to a local exhaust shop and chopped off that valve, sounds nice! Not bad for $30.

I wanted to hear how my truck will sound if I played with the exhaust adaptive valve, so I took a 2" clamp, turned the valve 90 degrees and clamped it really well. It sounded nice when the exhaust was cold, took it for a short drive and noticed the tone got better when the exhaust warmed up, slightly louder, defiantly not a $1k exhaust catback sound, but hey, it's FREE!! or almost free if you don't have a 2" clamp laying around. I'll leave the clamp for a few days, if I like the sound I might as well take that dumb valve off. Thought about passing this tip for anyone who's considering a catback or leasing his truck, this mod is totally reversible. On a side note, I searched all over the forum about the tailpipe diameter for the 2014 6.2L, and found that it's supposed to be the same as the 5.3L, which is about 3" or 2 7/8", but when I measured mine, it was 3.5". Did GM changed the exhaust on later builds or what?

That's weird, I installed the RC 2.5 lift kit, and I remember the instruction was to install bolts with the head down. I know you said you have leveling kit, but the lower spacer is basically the same!! Take a look at the instructions for the 2.5 lift kit.