I believe you can use an stock OEM MAF as a blow-thru with the SCT because there's adjustments the tuning program will do to the signal to compensate for those changes. You just tell it what kind of MAF you have and if it's draw or blow and it's good to go. But yeah,you need it chipped properly not just slapped on.

2000 Rio Red I4 Cougar 200whp & 210wtq at 9psi 254whp & 276wtq with NX 35shot WRX TD04 Turbo, Cut Short Shifter, Strut Tower Bar, 17" ZN Wheels, Roush Springs, Starion Intercooler, NX 35 shot, HKS SS BOV, Full 3" exhaust,StreetFlight Chip