Hi guys

Got myself a 1.3 endura-e mk5 fiesta a few months ago and welded up the shell and repainted not long ago. The car is on the road now and is running okay but have an engine management light on now, and the obd scanner shows bank 1 lambda sensor so i'm assuming it's the cat. I've been looking around for a 4-2-1 manifold for it but they're like hen's teeth, however i can find plenty for the HCS engine. Does anyone know how compatible the parts are from the HCS onto the ednura? I know that they are both shorter and generally different from the previous crossflows but not entirely sure if it would work. Also looking to up the power (rather than being the same as everyone else and throwing in a 1.6 or a 1.7) and have been researching about putting twin carbs on to replace the fuel injection and I'm looking for advice on that too. Any help appreciated!
Cheers
Ryan