So my my cat seems to be going out.. Or atleast I think it's pre-cat rattle. Getting worse performance, mileage is terrible (avg 19L/100km), occasionally smell fumes etc.. and there's this clackclack sound near the back of the engine bay. The clacking/ticking reverberates around so its hard to pin point exactly, sounds like its around the exhaust manifold. I only really hear it on startup and when I accelerate around low rpms 1.3k-2.7kish. I don't hear it when I'm idling. Some dude on another forum described this issue the same and they were made aware that it might not necessarily be a broken bit inside, but could be like the same effect as how a whistle works that can cause this sound. (I've attached a short clip of the sound, and the heatshield rattle you hear has already been solved. But listen for the louder clacking sound)

Or watch the longer version here, inside and outside sound-
But anyways, that isn't my primary question - just explaining it in case some else might have the same issue. So, I can't seem to find information about compatibility anywhere and don't have many options for test pipes here in Canada unless I'm spending an arm.

These are the ones I'm looking to buy atm:
Any advice, suggestions etc.. would be much appreciated!

 

I strongly doubt they're a fit, I would start by pulling the cats off and inspecting them with a borescope. It's pretty obvious when they're damaged, melted spots or pieces of the element cracked off.