There are no factory meters that can be installed that will allow you to run a larger injector that stock. period. The EEC logic has a defined curve programmed into it known as the "Mass air transfer function". This table tells the ECM what each voltage output from the MAF equates to. Factory MAF's are not "calibrated" they simply put out a signal and the ECM interprets it. This "mass air transfer function" can be changed, which allows you to run different meters (like my HPX, or an LMAF.. etc etc etc).
If you would like a good, cheap, sure fire way to run those 24# injectors, and don't want to buy an expensive aftermarket maf, PM me.