Rear RC-40 fitted with a pipe to bolt straight on to the catalyst for cars built late 1991 onwards (not early carb coopers). It has the hanger rods fited for mounting onto the rubber type straps. This makes it a single box system with a little throatier pleasing note, but a much better flowing more efficient system.
A less expensive alternative without the hanger rods is
C-STR809 rear box and
AN181T pipe. A twin silencer catalyst type free flowing exhaust is available as
C-STR812, original Rover types have all been replaced by a common exhaust which is quite restrictive.