Peace, mercy, and blessings of God be upon you. I have a FOX muffler. Very clean, it has been on a F-250 for a year. And clean usage. Without a valve or a device. The valve was taken for another muffler with its device. 600﷼ The serious buyer will not be disappointed. Its new price is 1250﷼. ( Phone number appears when clicking the contact button ) WhatsApp