went into a shop to have this done today. I was told it was 8-10 hour process -not buying that. They told me they can't cut and weld with manifold on. The process they said would be remove manifold cut and tac weld. Place it back for fitting, remove again and final weld and then install. I looked at it and it looked like there would be enough space to weld in place after removing the cats. Can you elaborate more on your process and the time it took?