This is the best blower money can buy bar none. Here are the reasons why! The M5 is a supercharger is a "modular" supercharger. Modular meaning the top and bottom of the supercharger are removable. The top and bottom sections of the unit also house the inlet and discharge ports. This allows the racer to tune/change the blower to his particular needs. DMPE Inc. developed this blower while dyno testing and modifying other units to meet customers needs. A huge advantage is the tune ability of the unit and the decreased time between blower tests. You can drastically change this supercharger without removing it from the car. Remove the hat, hat spacer, then the top insert plate. Once removed the whole top of the unit is exposed. Yes, you can see most all of the rotors when the top plate is removed. Insert your new billet top plate, reassemble and you are ready to test (or race). The bottom plate works on the same principle except you have to remove the unit to change the bottom plate/port. Now that testing and prototyping are complete we have billet top plates that accomplish different goals. The customer can move horsepower and torque around as you need it for your car, weather, or over-drive needs demand. The M5 is 100% 3D modeled and machined. This allows us to design in the computer, computer simulate and test the unit in virtual space. This also allows us to machine in ways never before possible. The M5 is 11 pounds lighter than the Kobelco and 3.5 pounds lighter in rotating mass. (rotors and drive train) When you purchase the M5 you obtain the blower (Billet top and bottom plate to meet your requirement), 14.2 restraint, and billet hat spacer. The cost is $13,500.00. When comparing the price you must compare to purchasing a Kobelco, Littlefield or PSI unit, paying a company to modify it to meet your needs, and also purchasing a hat spacer, and also the restraint plate.