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You've heard lots of buzz tests, I'm sure. I have been getting a lot of reps from this recording I made while testing my new AE software and posting what I learn in the 7.3L forum. I thought I'd share with other varieties of diesel engines. Injectors 3 and 7 were replaced this summer, so those are known good injectors. Compare the sound and form your own opinion. 7 and 8 are obviously farthest from the cam, so they will sound different because of loacation.
This is full definition, so feel free to open the link, select 1080 HD, bring up the volume (don't overdo it) and put your head between the speakers to get the stereo sound. For the skeptics... don't worry, it's not a trick.