I've been spending time on the Sniper forum and the biggest problem I see is that a lot of people don't understand how sensitive digital electronics are to RF noise. EFI wiring has to be protected from RF so that means resistor plugs, resistor wires, keep the ignition stuff away from the EFI wires, fly back protection on relays, etc. It is fairly simple to do it correctly but if you don't know what you don't know then you can screw stuff up.