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Boost and power are not linearly related. At higher boost-levels, say 20psi+, you get a lot more power increase for each additional PSI. Going from 15 to 20psi may get you +60-70hp, but going from 20psi to 25psi will get you an additional +100hp.
"Be aware that a temperature reduction AFTER the supercharger will not make more HP - as many experts would falsely lead you to believe. It's impossible. "
That's correct. What happens is that the CFM flowed remains constant even with a temperature drop. But that air will be at a lower pressure now with intercooling. So if you're running 10psi without intercooler, that same CFM will be down to 7psi now with intercooling for the same volume flowed. So you won't make more power, but will make the same power at a lower boost-level. Then... you can crank the boost back up to 10psi and flow more CFM for more power.
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