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Auto-Jet Muffler has provided mandrel tube bending, aluminized and 304 stainless steel tubing for the OEM, Truck, School bus, and off-road markets, primarily for exhaust, air intake and coolant tubes since 1959. Auto-Jet is your muffler manufacturer for mandrel tube bending fabrication. Auto-Jet manufactures and stocks Mandrel Bends exhaust tubes in diameters 1 1/4" through 6" and inventories over 3,000 pipes and mufflers in these sizes.