I'm planing to purchase a cat. converter for my h22a. But a friend of my recommended I should just purchase a Test Pipe. He said I would have more gain with a test pipe. Although, I'm thinking that I would lose some midrange torque with the test pipe. So, my question is: Is it worth me getting a Test Pipe or Cat. Converter? Also, I know with a test pipe I will not pass emission testing, but I got a buddy for that.