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Illustration Photo #1 - Mark Owen's NOS installation in a 1971 240Z - Left side view

A: NOS plate inserted between the intake manifold and base of carburetor has 2 spray bars in intake path, one for fuel and one for nitrous gas.
B: NOS secondary fuel line and fuel pressure switch routing fuel to NOS carburetor plate. NOS system comes on when switch is activated by gas pedal is depressed to near full throttle.
 

Illustration Photo #2 - Right side view