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, DOR/S systems are the perfect choice. This system includes exit pipes for both dual out rear and dual out side configurations so that you can choose the one that fits your style. Force II systems deliver a moderate exterior tone and moderate to mild interior tone, and are suited to customers looking for efficiency improvements without a lot of noise. Especially recommended for towing applications. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, this system includes all necessary parts and hardware for easy installation.Features: Cat-back Stainless Steel Natural Split Rear Exit Ford 3.5L Short BedProduct Description: 11-'13 Ford F-150. 3.5L Eco Boost Turbo, V6, All Wheel Bases, Cat-back, Pro-Series Muffler, Mandrel Bent 2.5in. 16 Gauge Tubing, 3in. Polished 304S W/Embossed Logo Tips, DOR/S, Force II, 409S Stainless SteelPit Stop USA offers Flowmaster Cat-Back Exhaust System - 2011-14 Ford F-150 3.5L Eco Boost Turbo V6 817539 at low everyday prices. Be sure to check out all our products from Flowmaster including Flowmaster Ford F-150 Exhaust Systems and Flowmaster Ford Truck / SUV Exhaust Systems.