years ago I did a extensive dyno test on three different intakes ona 496 C.I. 426 W pump gas motor, a Torquer 2, a M1 single plane and a Edlebrock Performer RPM.The RPM was better below 4500 RPM and the M1 was better above 4500 RPM with teh averages being real close to the same from 2500 RPM to 6500 RPM. The Torquer 2 was not close to either one We jetted for best HP on all three intakes with the same carb. I ended up putting the RPM on the motor for street use, the owner loved it