Manifold to Cat fixings on a cup

[Andyano12]

Ok so the Manifold to Cat fixings on my 172 cup have been bodged, basically 1 bolt through holds it, I've bough the Renault fixing kit but before I tackle this job is there a way of getting to the area easily, from looking it looks very difficult as the anti roll bar is in the way and there is no room to move around. Any help or tips from people who have already done this would be greatly appreciated.

Andy