Max Power exhaust, fits Sierra 2013. Its sound is amazing and it's an original nickel outlet. It has a small weld, half an inch, and it's been welded and is in good condition. Without an air device, it broke on me and I welded the valve, so it's always open. If you want to revert it, remove the weld and install an air device, which costs approximately 150-200, or install a switch for the same value from exhaust shops. The valve used to loosen slightly, meaning every 5 minutes the device would blow a small puff. (((The sound in the clip is a bit loud because I have a "why" installed))) Best offer