For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster Cat-back exhaust system provides. D.O.R./D.O.S. systems are the perfect choice, and include exit pipes for both dual out rear and dual out side configurations so that you can choose the one that fits your style. 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: SingleExit Position: Dual Rear Same SideExit Style: StraightHeat Shield Attached: NoInlet Diameter: 3.000 in.Inlet Inside Diameter: N/AMaterial: Aluminized SteelMuffler Count: 1Muffler Part Number: 9530572Muffler Series: 50 Series HDOutlet Diameter: 2.500 in.Outlet Outside Diameter: 2.500 in.Single or Dual: DualSound Level: ModerateSystem Type: Cat BackTail Pipe Diameter: 2.500 in.Tip Diameter: 3.000 in.Tip Quantity: 2Title: Flowmaster 17438 Cat-back System - Dual Rear/Side Exit - American Thunder - Moderate SoundTubing Diameter: 2.500 in.WARNING CA Proposition 65: YesWARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov