If the Garret turbos are anything like the Holsets..... there will be a snap ring of sorts holding in the silencer baffle/ring. I just took a small screwdriver to the ring on the Dodge/Cummins I had and it just popped right out.... ring followed right with it.
I dont know the specifics on the Powerstrokes, just the Cummins. sorry I couldnt be of more help. and I dont have a manual to read either.
The 04's have to be machined off. Straight pipe it if you want the sound. At the very least remove that CAT. 03's whistle like a jet, I heard one today. The 04's will sing too, just not as loud.
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