Honestly, you aren't likely to gain anything by either the MAF or the injectors. These are mods that you upgrade when your power level requires it, not to make power. Unless you KNOW that your future power level is going to be beyond the level of the stockers, you are simply spending money on something you don't need. You will require a tune for the injectors and the MAF also so consider that money as well. You should really datalog after your upgrades to see the duty cyles of the injectors and the max voltage on the MAF, THEN decide if you want to upgrade. Ultimately it is your money, so spend it how you wish.