Sounds like you'll have to load the factory tune and exhaust. I'm about to do this myself.
You have the AA signature with high flow cats? AA sells stubbies that the factory cats weld onto. This way, to put the primary cats back on, you only have to swap that small section and not the whole x pipe.
https://store.activeautowerke.com/co...ies-for-e9x-m3
This is the route I'll be going so, i figured I'd throw this out there.