There are no CARB legal OBD-II compliant high-flow catalytic converters.
We've covered it in the Integra FAQ.

Check it out for yourself.
http://www.arb.ca.gov/msprog/aftermk...es/amquery.php
https://www.honda-acura.net/forums/s...d.php?t=179764

Buy an OEM equivalent cat since it is the safest bet for dealing with our smog gestapo.

As far as sound control is concerned, all OEM equivalent cats are going to be a block-matrix type. They will be equally effective in breaking up sound waves, but that isn't their primary job.

If you are on the borderline of breaking Cali's 98 dB(A) sound limit, that's a matter best left to a new resonator or muffler.