Whipple f150 catalytic converter failing

Hey everyone, I recently inherited a whipple 5.0 f150 from my father. The check engine light has been on for years and reads code P0430. Everything I’ve seen online points to the drivers side catalytic converter being clogged. I don’t want to spend 2k on an OEM replacement just for it to fail
again. I thought about getting high flows installed but everyone online says they will fail just as quickly if the underlying cause isn’t fixed. Any advice would be greatly appreciated!