stage 2's
 

will my stock garret hold up to stage2 injectors and will my stock fule/oil systems support them.

the turbo will hold if you dont go over 25psi. it will be really smokie and probably get pretty hot pretty quick. oil and fuel will suport it but im not sure how well. you will need a fuel and hpop pressure guageto find out.

Stage 2's with mild nozzles will be fine. Whos stage 2 injectors and what size are they?

With your 1.15 exhaust housing it will be perfect! 25 is a little over safe IMHO, with the slower shaft speeds because of the 1.15 housing you would be fine in the 30-33 range...

If your fuel pump is good you will be fine, but I would get a electric fuel pressure gauge to be safe, keep it around 65-70 at idle and no less then 30 at WOT.

HPO pressures... you will just have to watch, if you have to you can get a Super Duty (17*)HPOP and swap that it...

ok thanks for the info. what brand would you suggest

swamps or cass injectors.

i would get a HPOP out of a superduty like csipsd had said, i had stage ones in mine and it threw the check engine light when getting on it for any period of time because the injector pressure was getting low and strokers use oil to pop the injector so basically the truck wasnt pushing enough oil threw the system with the 15* pump.