What is considered the "safe" limit for pre-turbine EGTs on these motors?

After looking here and there, I'm feeling like it's time for me to learn to weld aluminum. I've got the steel welding thing down pretty good. I like the Saab 9000 intercooler for it's huge area and it's slim profile. It should leave room for a slimline fan, A/C condenser and radiator and still let the hood close. I just don't care for the Plastic endcaps. I will be running a VNT-25 and don't feel like popping the intercooler. They have all aluminum ones for $700, but for that price I'm inspired to learn al welding and make my own endcaps.

Andrew