test pipes question

[rcboy514]

well this is prolly a noob question but I've been wondering basicly what are test pipes and what are the pros cons of having them? I know that they are in the exhaust system but I would like to know the purpose of them. does it enhance the performance or the sound any and also can they be paired with the nismo exhaust?

[generic808]

A test pipe is just a simple pipe which replaces the catalytic converter. Theoretically, it should increase HP by reducing exhaust flow restriction. It will make your car louder; however, they are illegal to run on the street.

[rcboy514]

cool thanks. Do you know of any high flow cats that would still be legal but increase power and sound?

Thanks in advance

[rcboy514]

so I was doing some research and it looks like I need a test pipe with a resonator to make it legal. Does anyone know of any companies that make one for the A/C yet?

thanks