Includes everything you will need to build your MegaSquirt Flyback board using the case as the heatsink.

MegaSquirt (PCB2.2) users running a number of very low impedance injectors have reported problems with the flyback circuit failing. Typically, this will happen with 4 or more low-impedance injectors, such as the Holley 85 lb/hr TBI injectors. This can be avoided by using resistors in series with the injectors, and disabling the pulse width modulation (PWM). However, a more elegant solution that continues to use PWM is the Flyback Board.

You do NOT need this if you are using a MegaSquirt equipped with the PCBv3.0, this is only for PCBv2.2 users running low impedance injectors!