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2011 F350 DPF Delete Noise

1K views 1 reply 2 participants last post by  HLBeef 
#1 ·
I noticed after deleting my truck that when I let off the throttle it makes an excessively loud "Pshhooooo" noise. On other delete trucks that roam my town, I don't really hear this on any except maybe one. What causes this and how can it be resolved? I can provide a video of what I mean if necessary.
 
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