I have found the blow through MAF meters to be less accurate/less sensitive when getting on and off the accelerator.This has shown up on a/f ratio measurements on the dyno as well.On the plus side,they seem to keep pace better(gain) when the throttle is snapped wide open in FI applications.I am not familiar with the SCT PRP.Is this a piggyback system capable of rpm incremental programming (fuel curves,Ignition timing curves etc.), and handling switching duties as well as data streaming?I am not saying I have all the answers,but I have been experimenting with cars for some time,have found some things work and others don't,and I NEVER stop learning and asking for advice.