Plastic Fuel Reducers in B series injectors?

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deity

Junior Member
i have a set of four 1997 obd2 LS (b18b) injectors. and all but one of them have this weid plastic, what looks to be, fuel reducer.

these injectors are going on my latest b20z build. if i pull them all out will i be ok? whats there purpose?

can someone please give me some information on these plastic fuel flow reducer things, and if i need them.

remember, i have 3 injectors with plastic inserts. and one thats missing one. i need to know if i can jsut pull them all out.
 
he is talking about the little round screens on the top of the injectors.
 
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