I recently purchased an AT4 withe the 6.2L. I love most everything about it, but I'm considering adding the GM produced/installed cold air intake and cat-back exhaust. All I'm looking for is a little more rumble, not trying to announce to the world I'm driving by or wake the neighbors when ever I pull in. There's very little in terms of reviews or vids out there to give me some insight. What do you guys think, Is the dealer's performance upgrade offering on the "tame" end of intake/exhaust mod offerings? Will it be an annoyance inside the cabin while driving down the highway? I know these are pretty subjective questions, and thank you in advance for any insight you can offer.