Hi guys, it's been a while since I have been on here posting anything. I have been enjoying the car not being broke. Now I am getting ready to start a turbo install and have a few questions. Is there a way to tell if a MAF is a blow-thru? I have a PRO-M 80mm. It is just a big open hole with no sensor showing. My other question is are all aftermarket fuel pressure regulators boost referencing?