Well, heres the thing, nitrous is only supossed to be used at full throttle over 3000 RPMs so that enough vacuume can accumilate in the intake. When the spark is cut, and nitrouse is flowing, you can* and that is loosly have a backfire. You can almost garuentee that it will exploid in the exhaust. Put it this way, when you have a cedilene spelling? torche, and you dont have the oxygen on it is just a flame of low temperature. As soon as you add that oxygen, it becomes a whole different ball game. Same thing with your case. I suggest running a relay (very simple to do) with your ignition power supply line. I think the quickshifter will have this somewhere. Just tap off of it and go to your local radio shack and get a relay.