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The positioning of the nozzle is crucial to optimum performance. There is an orifice for the nitrous to come out of on the other side of the nozzle, as seen here. You want that orifice to face downstream; this way, the incoming air charge carries the nitrous with it towards the blower. If you have the orifice facing the opposite direction, it will spray the nitrous against the incoming air charge, which will prevent it from blending properly with the incoming air stream.