How do you know when the head units need a rebuild? Mine runs, isn’t terribly noisy, but when datalogging, my load and Maf lbs keep decreasing over time. I have a 3.48 pulley on it currently and load peaks around 1.55. It used to peak around 2.10. I also used to peg the Maf sensor, and now I do not. I’m assuming it’s due to decreased air flow? My boost gauge still reads 13psi around 7,500. Not sure what else would cause the lack of airflow at the Maf.