GMC Sierra For sale: Electronic muffler for GMC Sierra 2011. I don't know if it fits the new model, I have no information, but it fits from 2007 to 2011. The muffler is clean. I removed it because the periodic inspection failed the car due to the muffler. I removed it and installed the complete original parts. It comes with the Y-pipe. Whoever wants a sound clip of it installed on the car can contact me on WhatsApp and I'll send them the clip. The muffler is called "Vacuum". I installed it for approximately 1800, not including the Y-pipe, which I bought used for 500. The sale is by offer, and I won't disappoint the serious buyer.