Get the stainless header and save the agro.
I had the same setup years ago but the empi 4 into 1 1/4" and a repacked stainless blue flame big bike exhaust.
Wrapped the header, with much difficulty as the pipes touched in places where they cross, so not fully covered. Metal cable ties are a must. If it's a daily driver it might be OK but mine rusted away anyway.
Replacement was a heritage larger bore stainless header and quiet pack, sounds nice, runs nice and looks nice and will not rot.