ok here's my problem. idk if hollowing out my catalytic converter would help to gain horsepower or if it would cause a decrease in HP and make my internals fuck up from bad readings and what not. i've searched for high flow cats. but they dont make any for my year...its an 02 miata. i was also considering a straight pipe, but if i got pulled over i wanted it to at least look like i have a functional cat. i hope you guys know where im going with this.

any help would be greatly appreciated.
-mierski