This is just my opinion, but to me, mine sounds like the 5.9's strait with 5" exhaust and alot of turbo whistle. Also louder than i expected, but thats a good thing. Now with the windows up its very quite. The sound from your computer doesn't do it justis when watching it on youtube!
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07.5 6.7L Cummins 2500 SLT QC 4X4, Brilliant Black, Thunderroad, AIRAID stage 2, 4" H&S DPF delete w/downpipe, EGR delete, deleted factory muffler, 5" tip