GMC Sierra For sale: Fox original Skyline muffler kit 3 inches, no back pressure at all Goes 140 when closed, doesn't suffocate or harm Custom made for the exit and the exit is original Custom made by Ben Mardah and the kit is a complete 3 inches Its sound is quiet and its tone is nice And it doesn't sound like you installed a muffler so that those people don't hear it when they close it anymore 🤣 The muffler is, in short, new And it has no sound and no device And it has no sound and no device