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Apply some thread sealant (not Teflon tape) to the threads of the small nozzles. Then thread in and tighten the nozzles. The small openings in the two nozzles should face slightly toward each other so that when the nitrous system is activated, the nitrous and fuel are sprayed into the center of the intake port on the head. For plumbing purposes, with the base of the manifold facing up, install the nozzles in the following order (beginning at the rearend moving forward): nitrous, fuel; nitrous, fuel; fuel, nitrous; fuel, nitrous.