Parts & Accessories Spare parts Peace be upon you I am offering you a Sierra 2014-2018 cat-back kit. It can be fitted to older models if you change the flanges, I think. The X pipe kit has mufflers, not resonators. Very beautiful, precise, and complete custom work. Bullet mufflers, two bullet mufflers, and behind them two resonators for softening the sound. Its sound is very beautiful, very quiet, and it gives a strong performance. Honestly, it did not get clogged or backfire because it was installed on a car without catalytic converters or resonators. It comes with the Y-pipe (the Y-pipe is from EXceed company) because the custom work is different and it fits any long tube headers. It comes with a device and a remote. The device and the whole job cost around 6000. For sale to the highest bidder (contact via WhatsApp).