[Big-Foot]

Hi Mike,

It would not hurt to ground the chassis of the HyFire box. The filter is actually a filter and voltage regulator to keep voltage spikes from hitting the Uni-lite or Magnetic trigger amplifier. Uni-Lites are nice, but very fragile when it comes to the current..

The funny part about running a ballast resistor prior to the ignition coil is that most CD and MSD type ignition systems gain their advantage by stepping up the primary voltage that is fed to the coil. The Ballast Resistor just knocks it back down..