RMI or any other ignition EMF "noise" can affect , and will, affect most modern cars and most EFI or other type of computer controlled ignitions and fuel controlled system Will noise affect a carbureted motor with no fancy electroinc controlled igntion, probally not That being said I learned the hard way that when MSD says to NOT use solid metallic core spark plug wires on thier race 7 series ignition boxes they are telling you that for reason I know several west coast NHRA stock class racers that bought, installed according to Nology directions, and use the Nology spark plug wires in the early to mid 1990s, thier cars where fast before and after the spark plug wire swaps, neither one picked up any measureable ET or MPH that I can remember Look very carefully at most of the new spark plug wires, then think about what that conductor is suppose to do They should complete the circuit between the coil and the spark plugs with the least amount of energy lost