Pypes Performance Exhaust SDT21V Muffler Kit Fabricated Using The Highest Quality Materials, Our Smooth, Seam-Coated, 16 Gauge, Mandrel-Bent, 409 Stainless Steel Pipe For 2009-17 Dodge Ram 1500 V8 Seam-Coating Treatment Of Our Pipes And Mufflers Enables Them To Resist Corrosion And Extends The Life Of The System