B&P flow more and imho are better suited as a TMIC. T&F suit a FMIC as they present less of an air flow restriction. T&F are cheaper, thats why they are OEM. Out of curiosity what do SWRT use ?
Heres a quote from the Hyperflow site: http://www.hyperflow.com.au/techmons.htm

The benchmark for pressure drop on the WRX has been the Hyperflow TMIC it outflows the Subaru STi TMIC by 19%. It has out flowed every WRX Intercooler (ours and competitors) we have tested.

Please note, it is rarely seen that any FMIC can even match the standard STi TMIC for flow.