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Muffler or no muffler - does it affect power ?

1624 Views 4 Replies 5 Participants Last post by  Mr_Roboto
On my 93 7.3 idi - previous owner told me he didn't like the loudness of the engine so he took it to a muffler shop and put a good muffler on it. From what I've read on this forum I wonder if this would cause a drop in power??
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