How can I tell if my sample tube is matched to my injectors? I bought the car with alot of mods done to it already and I was told to check the sample tube, but i dont know what i am looking for. I found out i have 42# injectors, it is a 73MM MAF. Anyone have any ideas. I have no clue at all. This is the first time i have dealt with aftermarket performance mods on a computerized car. Thanks alot. I am really not dumb, but i have not run across this before