Reviewed By Joseph P (HENDERSON, NV) Reviewed for a 2009 Ford F-150 —3/19/2015 11:26 AM
If you have an aggressive tune on your truck from mike@5star, or someone else then you may want to consider the Force II (50 series) over the Outlaw or American Thunder. I cant imagine wanting it louder than this. I have an intake(afe) and tune(91 performance) and this thing rumbles perfect. I threw on the heat shield too and it makes a suttle difference in cabin noise. I have seen a slight increase on mpg (0.5+mpg). LOVE FLOWMASTER SOUND!! Buddy has MBRP and no rumble to it!