I have a stock maf in my truck with the turbo kit, can my stock maf sensor be making it run rich? I checked my 2nd gear wot run and the maf voltage was alittle over 4v, and my rpm was 5k. Would i benefit from a mafia?

I have a mafia f7370. and im running a 06' f150 4.6 with a stock maf. I checked my data logs and at 5000rpm the maf sensor voltage is a hair over 4 volts. Would i benefit from the mafia?