Just purchased my first F150, an 07 FX4 with a 5.4. Love it so far, but will be researching some stuff... such as: best sounding aftermarket inexpensive muffler, and why does it go "Whomp!" sometimes when it shifts into OD.

 

Hey there fellow Bamian . I had Magnaflow that sounded great on a 2012 Silverado 4.8L sorry can't help with the " Whomp"

 

Welcome..
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Roll Tide!