| go with OEM. You'll need new injector O-rings and a new upper plenum gasket. Not sure what year Z you have but might want to consider the mod the turns off the injector +12v when car is off (later years do this). A number of posts on this and a few Auto-FAQ how-to write-ups. Since the upper plenum will be removed - good idea to either replace all the coolant lines underneath or just delete them (deleting is fine). There are write-ups on how to bypass that system. Also while in there - not a bad idea to replace the intake valve cover gaskets and if leaking, removing the exhaust valve covers and re-applying RTV since those covers don't have gaskets. Net of all this - lots of other things to do while the plenum is pulled including replacing the PCV valves.
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