From looking at the injectors it seems quite a lot of other Bosch injectors are very similar, I have some Bosch 0-280-150-901 18.55lbs@43psi, high impedance from a Toyota V6 3.8L somewhere and I think the body is the same as those, just comparing pictures. Too cold to mess with the Crossfire and not enough time but there are lots of injectors around 19-20lbs at 43psi which at 58psi? would be a good bit higher flow than stock.

Give the guys Maxwell suggested in post #27, RC Engineering http://www.rceng.com/ , or the ones HDDP recommended in post #28, Lindertech http://www.lindertech.com/, (or get the Feds to trackdown Maxwells expert - sorry just messing , couldn't resist).

I would guess they will have some ideas and it might save you trawling trash on the MB forums as well as this sad little thread.. Let us know is you find anything useful. Now HDDP is about to depart the NA ranks we need all the help we can get!