Sports cat for 4x4?

Recently acquired a Mk1 4x4.  It's a bit of a project at the moment.  I don`t know if it's the same for all 4x4 Octavia's but mine has a twin cat setup.   Does anyone know if there is a bolt on sports cat available for this car?  I was thinking of fabricating a single cat into the equation but it seems this would hurt ground clearance of the car or end up contacting the underside of the car.  The twin cat setup seems to sit nice and snug where it is at the moment.