Because they turn less rpm to develop the same boost, the larger displacement Kenne Bell BIG BORE Superchargers simply 1) make more boost, 2) produce more HP & TQ, 3) consume less engine HP to drive, 4) supply cooler denser air to your engine, while 5) reducing supercharger heat and wear. Largest displacement Billet Twin Screw. Highest HP potential. New design BIG BORE rotors (4.41 vs. competitions 4.11 and 4.17). 6x4 rotor lobes vs. 5x3 competition. Reduces male rotor speed 10% (1.5 vs 1.66 ratio). Hard anodized rotors for corrosion and wear protection. No Teflon to flake or rub off and clog intercooler. Huge boost / HP gains with same pulley ratio. Less rpm with same boost. Reduces friction, heat and wear. Cooler denser air charge temps. Lower parasitic loss. Larger pulleys - less slippage - more HP. Eliminates expensive overdrive crank pulleys, cog belts, etc. Up to 33% greater belt contact patch. Billet construction. Stronger than cast. CNC machined billet inlet and outlet. No porting required or ever recommended. Sleek, lightweight, high rpm design. Fits under stock hoods. Oil cooling pods.