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From everything I've read/heard, the 6.0 and 6.4 are very VNT dependent because the cam profile is designed to work with the VNT. They don't thump the turbine very hard because they don't have to due to the VNT.
That's why a 6.0 that can turn 4500rpm still wants a .70 turbine housing on an S300 where a 5.9 that'll only turn 4000rpm is still choked down by the .70 and wants a .80 or bigger.
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that's pretty much all of it
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