I am starting this thread to see if anyone has upgraded their fuel injectors. Stock BMW injector are single hole pintel design. More modern injectors are 4 holes. Lots of places say it will increase your fuel mileage over EPA spec.

So I am curious. Who done it and what was the result?

I read some old threads on bimmerforum and one guy with E32 740i has some major problem... got only like 8-10 MPG... and just by fuel injector change, he jumped into 17 MPG. Thinking of this guy's problem with such a low mileage... he had some serious engine problem... maybe major vacuum leak and lots of other things. Now, I don't know if this is real or not... so that is why I want to start a thread for the people who done it.