Flowmaster 817691 Exhaust System Kit. Title: Flowmaster 817691 Cat-back System 409S - Outlaw - Aggressive Sound. Flowmaster's Outlaw Series Cat-back exhaust system for the 2009-2014 Ford F-150 truck is perfect for the person looking for maximum sound levels both inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster.
Installed on 2012 Ecoboost. Gives deep note, minimal drone at highway speeds. Rich sounds on gentle acceleration, full on boastful sound at hard acceleration. Overall very happy. DOES FIT ECOBOOST.
Only took my local exhaust shop 40 minutes to install on my 2010 Ford Raptor 5.4L. Paired with the K&N CAI it sounds amazing. Just the right amount of loudness at idle and acceleration. Superb quality, looks great, and has an acceptable amount of drone at highway speeds. Also love the option to change from dual side exit to dual rear exit. If you have to choose between Flowmaster and Magnaflow, go with this kit.