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I understand what you have said, but from what I've read and can find I should be able to run the 3 bar OS on my setup (gen 3 truck ecu). Does this mean my hardware won't support the 3 bar OS?
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Any body on truck hardware have luck with upgrading to the 156 OS?? Im on 2001 hardware and would like to confirm that this works before spending another 2 credits!

Thanks folks, It doesnt seem...

So I'm just starting down the road of switching over to a speed density tune, everything previous to this in hptuners was good and everything lined out, but when I go to do the 3 bar speed density...