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. (Dual out rear) systems are the perfect choice. Force II systems deliver a mild to moderate interior and exterior tone, and are suited to customers looking for efficiency improvements without a lot of noise. Especially recommended for towing applications and daily driven vehicles. 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.