I use too run a enderle fuel injection system on my race car, and i asked the people at enderle the same question. they told me that the engine would only draw what air it needed,and that the injectors would be atomizing the fuel with the spray. I would think that it would not make any different s Manuel or electrical. the only problem I had was ,there was a lag from closed throttle to wide open . Enderle said that was because of the amount of air from the hat to injectors(running tunnelram intake with injectors in intake). Hope this helps