Your current MAF is not a restriction and if all you are doing is trying to extend the electronic range of the MAF, the MAF.ia will work really well. It'll be easier to tune with the MAF.ia and the stock meter, and it could even be done really well via mail order this way. The LMAFs work well, but still need adjustments after the base tune is done. With MAF.ias just a few things in the tune are scaled and usually once that is done, nothing else needs to be adjusted at all.
Don