I hope I am posting in the right place, first time to post here :great:. I have a 2010 Silverado Extended Cab Texas Edition. I had a Cherry Bomb extreme muffler installed, and everything was working perfectly for a little bit. However, I have started to notice recently an obnoxious noise when accelerating and crusing. I will do my best to explain it, but we all know how hard noises are to explain. For one, I know it is coming from the engine compartment, not behind it in the rest of the exhaust system (so I assume it has nothing to do with my muffler?). If you put your head down by the break pedal, you can easily hear that the noise is coming from in front of you. The noise can be heard when started up cold for about 15 seconds at idle, then it subsides until you start driving. Now to try and explain the noise. The noise is a very airy noise that almost sounds like a rattle at times. It can be heard when accelerating and cruising. It can be heard the loudest when at approx 2500rpms or when the vehicle drops to 4 cylinders and you are just cruising (then it almost turns into an airy chirpy noise). Now I know that aftermarket mufflers will be louder in the cab and sound weird when dropping to 4 cylinders, but this airy noise is completely different. The noise is extremely annoying, and I wish I could explain it better. I took it to my dealership and they said it was simply a result of having an aftermarket muffler installed. I have had previous work done at this dealership that I was less than impressed with, so I take their opinion with a grain of salt. I just need to be able to tell them exactly what the issue is so they will fix it. I have owned and driven other vehicles with cat back mufflers and never experienced or heard anything like this (even other GMs that have the V8/V4 switch), I am almost 100% certain it has nothing to do with the muffler since it is coming from the engine compartment. I am sorry for the long read, but please lend any advice. I paid to much for a truck to annoy the heck out of me every time I drive it! Thanks for the help!