I read MM&FF's first article they ever had about the Kenne Bell autorotor twin screw type supercharger and when they hooked it up to a 4.6L 2valve GT Mustang it was all over. At 15psi it over doubled the HP the stock GT made. The twin screw will be a revolution among superchargers. Its simplicity and efficiency will be absolutely rediculous for the Mustang crowd.