Well yes this is another post about the infamous knock noise that GM claims is normal. Well thanks to GM I listened to them after about 6 different trips to 4 different dealers trying to inquire about the noise and just having them all say its normal and basically shoo me out the door. Well I continued to drive my car pretty hard, I got my headers put on and took it down to the track drove it and then gradually the knock got louder and louder. Well once again I inquired about it again, i mean my car sounds like a da** deisel it knocks so loud, and they STILL said it was normal. I then got other opinions and took it back to the dealer a week later and I guess they got fed up with me coming in and all they said I could do is get a new engine put in for 9,000 dollars. I am so pissed that I am selling it so I have to find an additive that will best cover up the knock so I can get good trade in value.