DKSJLTrucks

I bought a new 2019 GMC Sierra SLT 6.2 about a week ago. Had the stock muffler, as well as the adaptive valves in front of and behind it removed. Had a Flowmaster 50 Delta Flow Added for a nice deep tone to enhance my driving experience that would not upset the neighbors. I still hear a chirping sound on a cold startup and when the truck kicks off at a red light and starts up. I know jack sh*t about engines or any of this. I just love trucks... and hate chirping. The chirping reminds me of the exhaust of the VW Beetle from the 70’s. Thoughts?