here in Canada, they can pull us over at the side of the road and do stop checks for cats, so i'm debating just putting high flow cats in place of the secondarys, I know this is an expensive route to go, but i've been down the catless route before, lot's of flames shooting out the back, always having to put around really low RPM if a cop is around so i don't noise pollute or shoot flames.
Catless is also a smelly way to go, and i also remember (because i drive with my windows open a lot) i would have to clean my roof liner once in a while with something like a magic eraser because it would go black from the exhaust after a period of time. So there are some drawbacks. But the power available is increadable. and throttle response is a bit better when completely cleared out
Just food for thought