Since the mustang dyno can vary the load, it can give you different a/f readings as well.
The a/f may be closer to what you see on the street with the Mustang dyno, since a dynojet "underloads" an '03, but what do you do with that possibly more accurate number?
Right now I think it has been esablished that cars that run in the 11's on a dynojet don't blow up. Maybe the mustang a/f number is closer to what it is on the street, so what if yours on the mustang comes back 12.0 or 12.3 or 13.0? does that mean you aren't safe? Maybe that would be 11.2 or 11.3 on a dyno jet? That is the problem as I see it, not enough guys have data from a mustang for you to compare it with.
I'm pretty sure the diablo guys use a Dynojet. Rick uses a dynojet and tests on the street as well.
well, rick said he checks a/f on the street with the HYABAWASSE or something like that. and then checks em on the dyno as well. so im guessing if the mustang dyno puts a load on to simulate the road it will work. i hope