I don't know what the rule of thumb is exactly, but suffice to say it robs substantially more to turn the supercharger. I put out 80 as I've heard it several times with this kit, others have speculated 100. At the end of the day it's neither here nor there though.
The Stillen kit, and information based thereon also considers both the stock Stillen heat exchanger as well as the poor MAF placement. That's the quest I'm on right now is with correcting both of those difficiencies how much better can it get as an improved air to water setup.
A similar setup to how I will be running, except full speed density tuning whereas I will likely be a hybrid when Seb tunes it finally in the coming weeks after the last parts arrive and my custom charge pipe is made, is running 525whp on the track regularly in Texas heat. And I don't mean 1320 where he's sitting at least 20 minutes between passes. I believe he has the stock V3 where mine has the si trim upgraded impeller - I also have 9 psi pulley but aren't running it until I know where this set up is capable of, or not.
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