EMI is the bitch of it all. I have a MSD ignition on my bench with a coil and test plug. The ignition and the coil is just like in the race car. I can fire up the MSD and have the board right next to the coil and all is fine, in the car it fails. The problem I am running into is that the wiring on every car is unique too. Some guys aren't even running a ground wire to the battery...they rely on the chassis to carry the load. I do have hope in that there are other electronics like data acq boxes that do work.