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We connected our Bosch EV1 fuel injectors before we put our huge Accel plenum in place and then started tightening bolts. Remember to tighten all the bolts coming in from the underside for the plenum. We go around tightening the lower bolts of the plenum, making two passes to ensure all the upper and lower bolts are tightened properly. You can see just how tight the injectors and wiring are between the lower runners.