Hey guys! I'm new to the forum and I'm looking to add a Flowmaster 70 series Big Block muffler to my 2010 XLT with 5.4L V8. Also wanting to know what the inlet diameter should be. I measured my existing pipe at 2.5in. Looking for a deep rumble at idle but not loud enough to wake my family. Anybody have experience with this particular muffler or have any suggestions?

 

Borla ProXS, your gonna put one on anyways after you get tired of the droning from the Flowmaster.