Ben, your running a Dbilas intake right? If so that is more than likely the reason for the low airflow readings, not because its not physically able to flow more air but because the size of the maf housing is larger than most intakes causing it to under read. I wouldn't worry too much though as your ecu will correct the afr accordingly. I had a Dbilas intake prior to my ITG which i modified to correct the maf scaling after seeing lower airflow readings than expected and slightly lean fuel trims.