2a. The only drawbacks of this system are its complexity and that the intake manifold must be removed from the engine so that the runners can be drilled and tapped for the nozzles. The positive aspects far outweigh the negatives though. Each nozzle has a passage for nitrous and fuel to be injected into the runner via individual jets. Because each runner has a separate supply of fuel and nitrous, each cylinder's air/fuel ratio can be tailored. If the cylinder is running lean, we can add fuel or take away nitrous with a jet change to get it running properly.