j-d wrote:
Go under when it's COLD and see if those heat shields are loose. Good chance they are. If the monolith inside has broken up, it likely would have clogged the outlet and you'd experience a severe loss of power. You might hear more of a wheeze sound in the exhaust instead of a pulse.
What year is your Ford Chassis? A 2004 RV might be on a 2003 chassis. E450, right?
Yes it is the E450. Is there a date code or something I could use to check the chassis year or does the VIN give you that information? Also, the sound is more of a clanging or metallic sound, not a wheezing or pulse sound.