Hello name is Mike been lurking for a long time finally signed up. Currently no mustang in stable had a 02 sold couple years back. Got 3 bikes in garage now thinking of selling the Harley and getting another mustang just not sure what one yet. My question is about pro m mass air meters. I was giving what looks like two 77 mm's with k&n filters but not 100% sure and of course this was after I sold mine. Pic in avatar. What I do know is they came off of a test machine at a buddy's work so they were never on a car. They have a pro flow sensor with model pft-77 calibration 19 any help will be greatly appreciated and hopefully in the next couple months I will have a new car to provide to the forum.