I'm thinking about changing from my current draw through setup; 90mm MAF, Vortech SC, aftercooler, to a blow though setup using a stock 05-10 MAF mounted the discharge tube between the aftercooler and TB. The MAF will be about 6 inches from the TB and 8 from the cooler. The discharge has slight upward bend. I already know it isn't ideal but if it doesn't make driveablity better I can switch back. I already have a MAFia and PRP software. My question is, how do I adjust the tune to compensate for the new MAF? Do I use a stock 05 MAF transfer function and scale the injector high slope to get the fueling close then fine tune the MAF transfer function? I think I can still use the MAFia to scale the MAF down if needed. How does the blow through know how much air it is reading if it is compressed? The draw through measures the air before it is compressed, but the blow through reads it after. So how does it know that xx lbs of air at 0psi is different than xx lbs of air at 15psi? I suspect they measure the same from the MAF but one is twice as much air if that makes sense.