Are Headers Do-Able For Street This Way?

[Homeboy981]

I'm trying to get more performance out of intake and exhaust systems. To that end I have been shopping Exhaust Headers for some time. However, IF you want to pass inspection, you cannot remove the PRIMARY CATS. I have looked into re-programming, mini-cats (about an inch or two long), spark plug de-foulers (moving out of exhaust stream)….ALL do NOT seem possible.

Then I hit on this….buy Performance Headers and have a muffler shop weld in the old cats from previous system. Is there any reason that should not work? The tube diameters are similar, they can weld in the bung holes for O2 sensors…and we're good, right?

If not, please explain….gently!