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what do you mean "do the injectors"? You want to clean them? if you don't have a high horsepower engine,there isn't any need to upgrade them to ones that flow more,there won't be any benefit.
If the engine runs smooth without pinging or other signs of trouble and there are no fuel leaks then there is no benefit to changing the injectors, maybe run some injector cleaner through them as preventitive maintenance.
The only reason I would ever clean and/or replace injectors is if I had a blown head gasket and had to tear down the top end anyway. Or was doing a total rebuild.
