Some years ago I modified it with a chamber floor plate the enables me to switch from "open" which is the flat plate that allows full X or H flow or a "closed" plate which is a 1 inch wide x 2 3/4 x .125 thick steel divider that gives more of the choppy hot rod exhaust note.
Now the Flowmaster merge pipe consist of two 3 inch pipes that touch at the center with a connecting port the gives a modified "H" flow which may act like an X flow crossover.
Anyway I had installed my divider plate a good while back and wanted to swap out to the "open" or flat plate for full crossover flow.
To my surprise when I removed the plate the 1/8th inch thick divider was gone having been broke off just above the weld.
Guess there is some strong pulsation going on from one pipe to the other!
Have used this setup for a good 10 years and first time this has happened. I did do a recent chassis dyno run with it in and when I did run it at the track used the open or flat plate. Nothing found inside merge area and no vibrations of a loose piece of metal in exhaust.
Plate on left showing broken off divider
