Jimny Cat Inards removal.

Hi all,
Apologies if this topic has been already covered. I have a 2012 Jimny, which I've owned for about 7months. Recently, it's developed a rattle from the forward Cat. I'd considered ordering a new Cat to replace it, until I read a few posts regarding Cat removal. Can anyone tell me if I can remove the inards from the front Cat without adversely affecting the car please? I've seen various references to fault lights coming on with no Cat fitted. It'd be really handy if, besides sorting the rattly Cat, I gained a little more oomph in the process. Also, can anyone tell me if removal of the front Cat inards renders the car an MOT failure please? Thanks in advance.

Took the exhaust manifold cat out on my 06 model as it was breaking up. I've still kept the other cat further down the system. No probes re mot emission test or EML issues. No real difference in performance.
Regarding MOT. If you have a standard looking exhaust system and it passes the emissions test then I don't think they'd be that bothered. They won't take your exhaust system apart just to see if there's a convertor installed

rather than the CAT failing I would check if the CAT heat shield is broken. This usually corrodes through on one of the spot welds and then buzzes and rattles.

I'll check that as soon as the rain stops. Cheers

I'll check the Cat heat shield, as suggested by mlines below, before I delve any deeper. Thanks

I doubt the original CAT has failed after just 5 years. I believe Suzuki employed a team of crack engineers to design them to fail at a similar time to the crank pulley and the crank position sensor, which is 80,000 miles or 12 years.

Just had a look under the Jimny, while the missus revved it up. Quickly found the culprit; a loose heat shield on the rear CAT. I've now fastened it securely with some copper wire from a set of old meter tails. Cost £00.00...result! Thanks Martin