To transfer ownership, I'm pretty sure thatyou will need one.
For license renewals, you will not until the car is 7 years old by model year.
And to do these tests, they now check for emissions codes stored in the ECU ( not tailpipe test). I don't know what the cat delete will do to that (which cat are you planning to remove, or both?).
So, even if yours is a 2011, you have 3+ years before you need to worry (unless you sell the car). If it fails, keep the part and put it back in, run it for a few driving cycles and a few 100km, then try again.
SOME SAY, that when he gets into his car, he plugs the IMA cable into his left ear Ö but no one can tell who is charging whom!