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??
An engine is a giant air pump, the faster you can get it in and out the more power it makes. Yes you would loose power but I doubt it would be anything dramatic
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