This is the 40 amp 4 pin relay and wiring harness that is used to activate most NX nitrous systems.
Nitrous Express Wide Open Throttle Nitrous Control Switch w/H.D. 60 Amp Relay
Nitrous;WIDE OPEN THROTTLE NITROUS CONTROL SWITCH W/H.D. 60 AMP RELAY
Nitrous,WIDE OPEN THROTTLE NITROUS CONTROL SWITCH W/H.D. 60 AMP RELAY
WIDE OPEN THROTTLE NITROUS CONTROL SWITCH W/H.D. 60 AMP RELAY
Nitrous WIDE OPEN THROTTLE N
Wide Open Throttle Switch
WIDE OPEN THROTTLE N
WOTSwtch
