Where are you?? That'll also depend on what you should do.
If you are in the UK just remove the rearmost baffle and you SHOULDN'T have to change them for an MOT. I got an advisory note that they were a little loud...

but didn't fail.
I was also more delicate with removing the baffle.
Firstly I got my dad to do it. He used a normal metal drill and made a circle of holes, then joined the holes up, and got a small grining stone for his drill and removed the excess bits to tidy it up.
And I still have my AI, just in case they start emissions testing bikes here (They all ready do cars)