I think the numbers are a bit optimistic.
(6 psi) / (14.7 psi) ~ 40.8% increase in power... or about 465 hp.
Conversely, ESS uses 5 psi and claims 445 hp for their stage 1 kit. The math says 442 hp, though some could be added for tuning and subtracted for the increase in heat vs the VF kit.
While the added cooling is of great benefit, I don't know that a little bit of cooling on 1 extra psi is worth $2100 and a more complex install. I'm still very interested though.
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