Kenne Bell offers many twin-screw supercharger variants, but the 2.8 liter High Output—2.8H—is the one for hard-charging Coyotes and GT500s. It was run for these tests. High Output means the twin-screw’s internal compression ratio is elevated to favor higher boost pressures, making the 2.8H more efficient by 15 pounds of boost or higher than the standard 2.8 blower, which in turn is most efficient at 8 to 12 psi. The blue Liquid Cooling nameplate and twin hose nipples on the blower’s forward bulkhead denote this supercharger’s use of water-cooled front bearings. This extra-cost option is an aid when boost rises, say the mid-teens on up.