GMC Sierra 2016 For sale: Sierra antennas, previously installed on a 2016 Sierra double cab. Full exhaust system, custom-made by Garage Exhaust Mart in Bahrain. Headers, Y-pipe, and the last connection piece (custom-made to look like the original for patrols). The muffler is an electronic Xforce with a very beautiful tone, and it's quiet when closed. Volant filter. Selling to the highest bidder.