The hypermax is basically the same turbo as the factory turbo with a T4 turbine and a larger exhaust wheel. You won’t really gain any performance by going to a factory turbo but will have better bottom end because of the tighter hot side, you will need to build a custom drain, intake hat and downpipe. For the work, I would swap in a small modern turbo like a s257 sxe or GTX35 turbo, I’ve fit both on that kit without issue.