For the person who is looking for a complete Header-back dual exhaust system with an aggressive tone. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.California Proposition 65 Chemical Name 1: Nickel (metallic)California Proposition 65 Chemical Name 2: Chromium (hexavalent compounds)Exhaust Series: American ThunderExhaust Type: DualExit Position: Dual RearExit Style: StraightHeat Shield Attached: NoInlet Diameter: 2.500 in.Inlet Inside Diameter: N/AMaterial: Aluminized SteelMuffler Count: 2Muffler Part Number: 932556Muffler Series: 50 Series Delta FlowOutlet Diameter: 2.500 in.Outlet Outside Diameter: 2.500 in.Single or Dual: DualSound Level: Moderate/AggressiveSystem Type: Header BackTail Pipe Diameter: 2.500 in.Tip Diameter: 2.500 in.Tip Quantity: 2Title: Flowmaster 17149 Header-back System - Dual Rear Exit - American Thunder - Moderate/AggressiveTubing Diameter: 2.500 in.WARNING CA Proposition 65: YesWARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov