| Don't know if it's of any interest/use but I now have software to alter the fuelling on the new 5.9 ECU.
It's only a software version of the trimmer in the old ECU and the setting only applies to the idle, but the ECU uses this as a base datum from which to work from.
I've heard that the stock ECU can handle the pipes if the fuelling is set up right?? Don't know but it's there as a further option? | 
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