aFe POWER introduces an all new Rebel Series dual middle - side exit exhaust system for 2011 - 2014 Ford F150 EcoBoost with V6 - 3.5L (tt) engine. This Rebel Series cat - back is designed with dual polished exhaust tips that exit in front of the rear passenger tire for a unique, aggressive look. The tips come with a unique aFe Power logo laser etched on the side and constructed from stainless steel for durability. The exhaust system is constructed from 3 into dual 2 - 12 MIG - welded, mandrel bent stainless steel tubing for maximum flow, increased horsepower and torque. In testing, this cat - back exhaust system added an astounding 15 horsepower and 18 lbs. x ft. of torque as verified by our in house dyno. This kit uses an 18 free - flowing muffler to absorb high pitch tones producing a powerful sound, virtually eliminating drone. The performance cat - back exhaust system includes all necessary hardware and clamps for a hassle - free install, with no cutting required making it a true bolt on system.