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I have a '02 7.3 and they are a little noisy when you first fire them up, but after it warms up it is actually pretty quiet at idle. Not that bad at highway speeds either. I can easily talk with back seat passengers without raising my voice. Stay away from the first 2 or so years of the 6.0 If you want a 6.0, go at least 2005 or newer. I do agree with WesHoffman49, the 7.3's are much more reliable than the newer generation diesels. It's a great motor, that's why I got a 2002 and not newer. I was even looking at a 2003 king ranch that cost less than what I bought, but it had the 6.0 (aka 6 blow) and a little higher mileage. 7.3's are hard to beat.
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