Conversation Between Scottwax and Andypot1985

Hey Scott,

Reading in the forums i guess you have gutted your cats? I am a little confused about all this talk about precats and such. I pulled this photo of someones exhaust off google. http://www.greghome.com/images/Maxim...xSE-YPipe2.jpg is the precat the pipe with the green mark? are there any more? thank you