I've heard of folks claim Ford switched to 21 lb pink injectors on Mustangs near the end of 2002 and on many 2003 - 2004 Mustangs as well. They're (by the numbers) supposably 21.5 lb and it's rumored to be because of the increased in size (85mm) mass air meter. I don't think they're 21's personally, Ford normally rates their injectors at 39psi (I think) which is less than the industry standard (maybe 41 or 42psi) so they're a discrepancy as to what they'd flow with more pressure and I think that's how those pink injectors were rated. Maybe they were outsourced from a different company (not Bosche). I dunno just speculating.
bringing this old thread back to life i have some brand new pink ones that i want to put in my stock 88 roller motor.i have a 93 upper and lower cobra intakes with mass meters and such any problems with idle ?