Hello I got these injectors some time go and was told they were red 19# injectors off the newer 5.0 mustangs but i look up the part# on them and found out they are 22# injectors D9D http://www.fiveomotorsport.com/Injector_SetsMODS.asp#bosch19 what I was woundering is will these work of with my MAF the is set up for 19# injectors?
They won't work correctly because the injector flow rating must match the Mass Air "transfer function" or output versus airflow, said another way.
You could put them in but expect the engine to run a bit rich. Backing down the fuel pressure might also be appropiate in that case, so they flow more nearly that of the 19 lb units.
On a Speed Density system you could get away with it because the MAP sensor does the load signaling in the absence of an air meter and the computer will reset it's tables to account for them up to +/- 12% either way.
If i got a maf sinser off a cobra for 24# injectors I gyess the engine would run lean then or could i just pump up the fuel presser? note i have AL9 computer from a 89 mustang with a superchip installed and the chip makes it run richer and the chip says to remove the cats
Your getting into too many unknowns.
The a9l eec is calibrated for 19 injectors unless the chip change this.
You will have to try it and see what happenes.