How many pounds of pressure are a 3.8 liter buick regal's fuel injectors under?

M

My 10 cents

New member
I may want to upgrade my fuel injectors but i need to know how many pounds of pressure my current fuel injectors produce. Also, if I were to change the fuel injectors would there be any seals, bolts etc. that need to be replaced from the age of the engine?
If they are replaced to a higher pressure how would I go about updating my ECU to be able the new fuel injectors?
 
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