Flowmaster's new Force II systems for modern diesel trucks bolt on directly behind the DPF for 50-state emissions legality and feature mandrel bent stainless steel piping. The systems are carefully engineered on the vehicles for fitment, performance and mild sound. Some systems feature Outlaw mufflers when some sound control beyond the DPF is needed, while others eliminate the muffler entirely. All systems feature Flowmaster's lifetime limited warranty and all necessary installation hardware.Warranty Information:Limited LifetimeCalifornia Proposition 65 Chemical Name 1: Nickel (metallic)California Proposition 65 Chemical Name 2: Chromium (hexavalent compounds)Exhaust Series: Force IIExhaust Type: SingleExit Position: Single SideExit Style: StraightHeat Shield Attached: NoInlet Diameter: 4.000 in.Inlet Inside Diameter: 4.000 in.Material: Stainless SteelMuffler Count: 1Muffler Part Number: Kit OnlyMuffler Series: OutlawOutlet Diameter: 4.000 in.Outlet Outside Diameter: 5.000 in.Single or Dual: SingleSound Level: Mild/ModerateSystem Type: Down Pipe BackTail Pipe Diameter: 4.000 in.Tip Diameter: 5.000 in.Tip Length: 14.000 in.Tip Quantity: 1Title: Flowmaster 817621 Axle-back - 409S - Single Side Exit - Force II - After DPF - Mild/Moderate SoundTubing Diameter: 4.000 in.WARNING CA Proposition 65: YesWARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov