yup, that's they. no, I have no idea if they have experience with the callaway turbos but if they can get their hands on one, I think they may be able to help. if they know the physical dimensions, bolt patterns, and flow rates, they may be able to fab something that would work.
they also do lots of turbo repair work. another outfit is Majestic turbo in Tx. Turbonetics and Rick Heads new turbo company (can't remember the name right now) Turbo engineering or something like that also may be able to help.
a good buddy of mine went through 3 pairs of turbos on the early callaway drag racing it before the oiling problem got fixed. callaway requested he NOT return, all were done under warrenty.
he definitely was HARD on the car and finally sold it.
he's now running around in a 555 ci all alum c4!!!