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