I'm not sure if this has been asked before but I searched and could not find anything that answered my question. If my motor is a Na b18a1 how would bigger fuel injectors help my engine and would i need to get a tune to run them? And how many cc do stock b18a1 injectors flow?

 

b18a1 should have 240cc injectors. Have you done anything to the engine? if not than bigger injectors wont help much.

 

It's got b16 manifold and a 7lb flywheel with intake and dc headers. I ask cause I have some injectors from a bmw 525i v6 andi was told i could run them. would I need a tune.

 

yes you would need a tune and no you're not going to benefit from them. unless you're running boost or have a nasty n/a build its just not necessary.