you mean low impedance? i have dsm 450's and yes when i have the stock ecu connected the car starts right up but when i switch the injectors over to ms my car wont start because the injectors arent spraying which is leading me to think that its got something to do with the error i get when i open up megatune when ms is connected to the laptop. Thats the only thing it can be, the ms grounds are good and the injectors are getting power while cranking.