GMC Sierra 2017 I am offering the old Bolt muffler with two outlets, both outlets are detachable. And the "Y" pipe. Note: The muffler and "Y" pipe are guaranteed to be without leaks or any other issues. Just remove and install. The device fits models from 14-18. And a kit for shock absorbers, springs, and shock absorber extension. All used for one month. Selling to the highest bidder.