Originally Posted by Team STILLEN
Do you know if its maxing out the MAF? How close to 5V's is the reading at 5 psi ? It might be pegged out. Might need some MAF cal, bigger housing, different MAF to read higher boost.
I was just going to post about this. It sounds like you're running into an issue where you've reached the max hertz(frequency) with this MAF.
If this is the case, any improvement to airflow will result in issues even at lower boost levels.
Fear not though, you can upgrade to a larger diameter tube and recalibrate that MAF, or go with a MAF that will read a higher frequency and calibrate that MAF.
Trifecta should know what to do here. I'd start with the V8 MAF, I believe that would be a good place to start.