DroSometimes

HI, As the title suggests, I'm replacing my exhaust for a Cobra Cat-back resonated Sports exhaust and would also like to replace the Catalytic converter & Downpipe as I'm uncovering some pretty shoddy work on the car and the parts look worse for wear. I've been told they're fine but I'm the type of person to just replace the entire system for peace of mind. I can't seem to find a good place to buy one of these systems? any advice is greatly appreciated