Now, I would like to see your 6.4 on pair of turbos! Nelson Racing Engines from CA makes a Hemi they say gets 2000hp...
https://www.youtube.com/watch?v=wHmx6KvL69U
or more for your application a mere 700hp.
https://www.youtube.com/watch?v=cnBbofUhCdE
These are like 50K or more but hey if you want to play you've got to pay.
But getting back on point. It is so hard to compare bolt on kits true performance values because most of the time these units are designed for street driving applications. So they tend to make sure that the vehicle has a pretty broad power range and sacrifice a lot performance for reliability and drive-ability. But, usually what they get customers hung up on is manifold pressure. Yes, there is a relationship between manifold pressure and volume of air reaching the cylinder heads but it isn't a linear relationship if you are comparing two different units. I don't think Useless Pickles wants to accept the fact that you really need to know the volumetric efficiency of each unit at a specific rpm range. That is what is really going to tell you how much power you are going to get at specific boost setting.
For all we know the Ripp unit could be flowing twice as much air into the cylinder head as his Prodigy's Garrett turbo does at 1800rpm which could result in a 40% increase in power at that rpm range over the stock engine. It isn't impossible that unit could turn say 75hp into 105hp at 1800rpm. However, the fact is they might have really played around with this engine as well.
At the end of the day you are correct we need more information about how they've setup the systems and what their goals were.
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