Catback with واي Sierra - Silverado BTM from 2007-2013 Condition: Used ((two runs)) only The car I installed it on was not tuned, meaning it was not subjected to pops and bangs, and its condition is like new. Feature of the muffler: if you close it, there will be no backpressure, God willing, this is what the company says. Muffler size: 3 inches. Muffler valve flap thickness: 4 mm (thicker than usual valve flaps). Benefit: stronger resistance to pops, bangs, and cutouts. BTM Catback with the device (electronic) 3 inches. Steel 304. Increases engine performance and horsepower. Please do not undervalue the item. Location: Riyadh. Selling as a set with the واي. Offers less than 4000 will not be considered.