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The Kenne Bell Blowzilla 2.1L system we're using (PN TS1000-GT; $3,099) comes pre-assembled, and features a 90mm throttle body flange and KB's less-restrictive Flowzilla inlet. The assembly bolts directly onto Ford Racing Performance Parts' GT-40 lower intake manifold (PN M-9461-B50; $150) using supplied hardware. Internally, the supercharger features two gear-driven rotors that turn in clockwise and counter-clockwise directions. The rotors intermesh in a screw-type fashion, which literally squeegees air from back-to-front, and discharges it through the top of the unit.