Gibson SFT Superflow Dual/Dual Round Muffler - 8x24in/3in Inlet/2.5in Outlet - StainlessGibson SFT Muffler delivers the powerful 'big block' sound at the tailpipe with more usable pulling power and torque! The Gibson difference is that our mufflers are quieter inside the cab than any other aftermarket muffler. Featuring a baffled and chambered Muffler (not packed or screened, nothing to blow out)for better volume efficiency with unrestricted flow. All welded construction.