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Kenne Bell uses efficient Twin-Screw superchargers. The standard kits employ a 1.7-liter supercharger that's an animal right off idle and can't be bested up to 10-12 pounds of boost. With 20-24 pounds of boost planned for this Two-Valve showcase, KB stepped up to its 2.2-liter blower. The only difference is in length, and 1.7-liter owners can retrofit a 2.2-liter Blowzilla if desired.