poly motor mounts solidify the drive train essentially putting more power to the wheels then twisting the motor/trans in it's mounts. Helps get that extra 0.0001 on the drag strip. The strut tower bar stiffens the front up a tad for going around corners. The centrifugal has more efficient then the blower because it doesn't require near as much HP to spin it up. A nice compromise between a blower and a turbo.