Parts & Accessories Spare parts Magnaflow Max Power exhaust system fitted on a Sierra 2023. Single exit, stock bumper, with 2 remotes. Its sound is nice and quiet. Clean and has never been abused or overheated. The vehicle is like new. To be honest, I had an issue with the exhaust valve closing, and they told me it only needs a device to fully silence the exhaust 100%, and the device price ranges between 350 to 450. It has not been appraised yet, and there is no set price. Serious buyers only, please.