I've had a few people ask me about the CDI box and what it does and is it necessary etc etc... Its basically the next step in scavaging whatever power is to be found in an engine. You can help an engine breath by putting more air and fuel in and getting it out thru compression, induction, cams.. etc. but the another way to fine tune the process is thru timing and burn efficiency. The MSD 6AL is a standard for drag and other applications, but the StreetFire is perfectly fine for a 4 banger with supporting components. What are supporting components? Well the rest of the ignition system needs to be able to support the extra coil winding power. Here's my set up in addition to the StreetFire CDi 1) low impedence (ohms) spiral wound copper core (radio supression) wires. I have Magstar Racing 100, but Magnecor, Accel, MSD, VMS (claim the lowest ohms in indistry), or others should work fine too. 2) non resistor spark plugs.. the resistor, and fine electrode iridium tips are perfec...