Think about the millions of millions of vehicles registered in this country, and then think about what percentage of them have ever seen a racetrack. Not many. Race cars aren't street legal.

In basically any Honda application you can get a plenty big enough cat to meet your flow requirements. Slapping a test pipe on a basically stock motor is just stupid--it doesn't make any more power than a good high flow cat, your car will stink, not be street legal, throw an oxygen sensor code, and spew a bunch of nasty hydrocarbons.