Need some quick help with MAF's

[burninskulls0911]

So i just put an rb25 in my s13. I had the harness professionally converted by Carisma.
well the car seems to break up pretty bad once i hit full boost and i putting tons of black smoke out the exhaust when it starts to break up, which leads me to believe that it is running rich.

well i ran the part number on the MAF (22620 05U00 A36-000 J70)
and it ended up being a stock MAF from an rb26dett

now my question is, will the fact that its an rb26 MAF cause it to be running like this?

the motor is all stock besides a FMIC and freddy intake manifold..

thanks for the help
Adam