My car is very standard at the mo and i want to add an fmic and full 3" exhaust. Will i be able to get the standard ecu remapped if its running lean - i mean without using anything else like a chip or safc etc...?

I should get something else to help with fueling etc... but im planning to buy an apexi power fc in the future so in the meantime i dont want to spend money buying anything else so thats why im asking about mapping the standard ecu.

So what do you think?

Thanks.