High Flow Catalytic

i asked the shop to bang it out for me..... they used one of those rubber malots to bang it out.... but i believe they also put something in it to help it break apart..... i'll find out how it was done.. then i'll repost again how to do it....
i was almost busted in the summer cuz the cop did this retarded inspection of my car. made me pop the hood and everything.... and asked me about my exhaust... blah blah blah.... but to make a long story short.. he did ask me if i still had my cat on.... and i said yes.. you can see for yourself.... so i showed him... and he did let me go....