What Size Is the Exhaust

I am looking to buy a new exhaust and wanted to know what the inlet size for the new exhaust should be. Thanks

Ive just bent up a new one for mine out of 2 inch tube kept the CAT in and an old skool cherry bomb on the rear has got a GR8 sound but not to loud

That's what my plan was as well. But once I cut the back off i want to get a cherry bomb
Which will fit straight on with no need for adapters or anything

the bore of the standard jimny's pipe is 1.5"

my cherry bomb had a 2" inlet and a 5" external lol

but as the inlet to the cherry bomb was bigger, I just cut it in several places to crimp the end and abit of welding sorted the job