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I’m not up on the 6.0 at all but I think it is completely different than the 7.3 turbo. I think it may be a variable vane style. The WW should help with surge and may whistle a little better. Mine whistles very loud, I can really hear it echoing off buildings and stuff with the passenger window down. You got it straight piped??
 

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Not really, my buddies 01 with stock turbo and my early 99 with stock turbo (early 99 came factory with wicked wheel) both whistled very similar at the tail pipe except his is straight piped and mine has the 5” exhaust system. Mine has a lot mellower tone but the whistle is similar. I think the new D-66 turbo whistles a lot louder but it may just be because I got used to the sound of the bad factory turbo after it headed south.
 
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