I have a stock b18a1 and i was wondering if I put bigger fuel injectors on a stock motor would it make a difference? what ecu would i need to tune it? And if adding bolt ons would help the fuel injectors out?

Get bolt ons first and upgrade injectors on as needed basis. As for ecu, do a bit of research. You might be able to just chip yours and run somesort of piggyback...im assuming that is. Talk to your local tuner\shop, they should know whats good...you might not even have to upgrade injectors..=)

unless you max out the load on your current injectors and need something bigger to compensate for whatever your build calls for.

Oh ok, thank you