Headers, Cats and sensors.

Giddy all, a quick question for those with aftermarket exhausts on their P5/SP20s

I've recently ordered the Pacemaker header for my SP20 link and the info page states it needs aftermarket catalytic converters. Do I need two Cats or will the one behind the headers work fine on it's own? And will I need to stick a bung behind the cat/s for the O2 sensor? The standard system has a cat in front of the engine, then another one just behind it, then a resonator(?) then a muffler behind the rear wheels.

I'm going to replace the whole system in one go but need to clear up a few things first, the last exhaust I did was just one muffler for my mk2 Escort much simpler!

Hi that header looks fun

To my knowledge with a cat back set up, you may not even need a CEL fix as it places the second sensor after the cat. You may need to extend the wiring to fit.

Perfect time to get a nice muffler too ;-)