Vortech
Hey sir
I have a Vortech supercharger and It has what you are looking for It pulls all the way to redline making more boost as the RPMS go up. As for roots style I know the boost is flat so what you feel downlow you may feel the same if not a bit more up top.
As for a centrifugal supercharger Like the vortech kit. The boost keeps building and maxes out at redline.
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