haha yeah as tailgating motorbikes tend to find when I hit the accelerator (typical Microtech overfueling LOL).
My high flow cat blocked itself solid within 3 months of me buying it, due to the computer, so a 'race' option was the only way out of it. When I get a computer which runs an 02 and is tuned properly I'll probably lash out and get a metalcat (just have to make sure its EPA compliant so that its not just an expensive waste of time)
I have been EPA'd for noise, and the tester mentioned the cat, but it does have one fitted, bit hard to talk your way out of having just a piece of pipe there.
You tend to smell the unburnt fuel a lot with no cat, and the smokescreens are bigger, I have a black car so haven't noticed black stuff on the rear bar lol.