I was wondering if it'll be ok to put a flex pipe between my header and my exhaust and get rid of the cat? I just picked up a pro-fab header and a fujitsubo exhaust and don't know if I should put a test pipe in first and add the flex pipe after the test pipe. Also, do I have to weld the flanges on the flex pipe as well? Need to know asap. Thanks.

 

come on, anyone?